Rachel's score of 38 implies that her score is below the 55th percentile.
Rachel's score of 38 indicates that she scored below the 55th percentile. To understand this, we need to consider the distribution of scores among the 55 examinees.
The 55th percentile represents the score below which 55% of the examinees fall. Since Rachel's score of 38 is below this percentile, it means that 55% of the examinees scored higher than her.
To determine the percentile corresponding to Rachel's score, we need to calculate the cumulative percentage of examinees with scores lower than or equal to 38. This can be done by dividing the number of examinees with scores lower than 38 by the total number of examinees (55) and multiplying by 100.
Once we calculate this percentage, we can compare it to the different percentiles to determine where Rachel's score falls. Based on the given information, her score of 38 is below the 55th percentile.
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ne Saturday you saw Alice and Bob sitting at the bar together next to each other. You spoke to your friends and introduced them to each other. Over the course of the next year you see Bob showing up on Saturday 52.8% of the time and Alice 25.2% of the time and now 38% of the Saturdays neither of them are there. Have Alice and Bob become friends? Are they indifferent to each other? Or, do they dislike each other? Justify your answer by comparing the probability one shows up given the other does to the probability one shows up in general. Again a blank contingency table is provided. A AC B BC I
Considering the given situation, Alice and Bob might have become friends. However, it cannot be concluded that they are very close to each other or dislike each other.
Let us first complete the contingency table:
A AC B BC I Alice P(A) 0.252 P(AC) 0.748 Bob P(B) 0.528 P(BC) 0.472 Total P(A ∪ B) 0.78 P(AC ∪ BC) 0.22 P(A ∩ B) 0.002 P(AC ∩ BC) 0.218
P(A ∪ B) = P(A) + P(B) - P(A ∩ B)0.78
= 0.252 + 0.528 - 0.002From the above calculation, we can find the value of
P(A ∩ B) as 0.002. P(B|A)
= P(A ∩ B)/P(A) = 0.002/0.252 ≈ 0.008
= 0.8% P(B) = 0.528As given,
Bob shows up on Saturdays 52.8% of the time, which is
P(B). P(B|A) = 0.8% > P(B) = 52.8%This means that if Alice is present, the probability of Bob showing up is much higher than if he is just showing up on his own. Hence, they might be friends. However, this cannot be concluded for certain, as they may not be very close to each other or dislike each other.
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Is this function continuous everywhere over its domain? Justify your answer. [(x + 1)², x < -1 1 f(x) = { X, 2x-x². -1≤x≤1 x>1 [4T]
Since the function is continuous at every point in its domain, we can conclude that the function f(x) is continuous everywhere over its domain.
To determine if the function f(x) is continuous everywhere over its domain, we need to check if it is continuous at every point in the domain.
First, let's consider the interval x < -1. In this interval, the function is defined as (x+1)². This is a polynomial function and is continuous everywhere.
Next, let's consider the interval -1 ≤ x ≤ 1. In this interval, the function is defined as a piecewise function with two parts: x and 2x-x².
For the first part, x, it is a linear function and is continuous everywhere.
For the second part, 2x-x², it is a quadratic function and is continuous everywhere.
Therefore, the function is continuous on the interval -1 ≤ x ≤ 1.
Finally, let's consider the interval x > 1. In this interval, the function is defined as x. This is a linear function and is continuous everywhere.
Since the function is continuous at every point in its domain, we can conclude that the function f(x) is continuous everywhere over its domain.
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Determine the area under the standard normal curve that lies to the right of (a) Z = -0.93, (b) Z=-1.55, (c) Z=0.08, and (G) Z=-0.37 Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). (a) The area to the right of Z=-0.93 is (Round to four decimal places as needed.) (b) The area to the right of Z=- 1551 (Round to four decimal places as needed) (c) The area to the right of 20.08 (Round to four decimal places as needed) (d) The area to the right of Z-0.37 is (Round to four decimal places as needed)
To determine the area under the standard normal curve that lies to the right of $Z=-0.93$, we will use the standard normal distribution table.
What is it?The standard normal distribution table provides us the area between $0$ and any positive $Z$ value in the first column of the table.
We will look up the value for $Z=0.93$ in the table, and then subtract the area from $0.5$ which gives us the area in the right tail.
The standard normal distribution table provides us the area between $0$ and any positive $Z$ value in the first column of the table.
We will look up the value for $Z=0.93$ in the table, and then subtract the area from $0.5$ which gives us the area in the right tail.
The value for $Z=0.93$ is $0.8257$.
Therefore, the area to the right of $Z=-0.93$ is $0.1743$$
(b)$ The area to the right of $Z=-1.55$.
Therefore, the area under the standard normal curve that lies to the right of-
(a) $Z=-0.93$ is $0.1743$,
(b) $Z=-1.55$ is $0.0606$,
(c) $Z=0.08$ is $0.5319$,
(d) $Z=-0.37$ is $0.3557$.
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20. Using the Cockcroft-Gault equation, calculate the creatinine clearance for a 74 year old female with a S.Cr. of 1.2, actual body weight 60 kg, height 160 cm.
For a 74-year-old woman with a blood creatinine level of 1.2 mg/dL, an actual body weight of 60 kg, and a height of 160 cm, the estimated creatinine clearance is roughly 45.83 mL/min.
To solve this problemThe estimation of creatinine clearance, a gauge of renal function, is done using the Cockcroft-Gault equation. The formula is as follows:
Creatinine Clearance is calculated as follows: [(140 - Age) * Weight] / (72 * Serum Creatinine).
Where
Age is the years of ageThe weight is expressed in kilosThe serum creatinine level is expressed in milligrams per deciliterLet's calculate the creatinine clearance for the given information:
Age: 74 years
Weight: 60 kg
Serum Creatinine ): 1.2 mg/dL
Creatinine Clearance = [(140 - Age) * Weight] / (72 * S.Cr)
= [(140 - 74) * 60] / (72 * 1.2)
= (66 * 60) / (72 * 1.2)
= 3960 / 86.4
= 45.83 mL/min
Therefore, For a 74-year-old woman with a blood creatinine level of 1.2 mg/dL, an actual body weight of 60 kg, and a height of 160 cm, the estimated creatinine clearance is roughly 45.83 mL/min.
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Let C be the curve which is the union of two line segments, the first going from (0, 0) to (-4, 3) and the second going from (-4, 3) to (-8, 0).
Computer the line integralImage for Let C be the curve which is the union of two line segments, the first going from (0, 0) to ( - 4, 3) and the sC -4dy -3dx
The line integral along the curve C is the sum of the line integrals along C1 and C2 is 60.
To compute the line integral along the curve C, which is the union of two line segments, we need to parametrize each segment separately and then integrate the given function along each segment.
Let's denote the first line segment from (0, 0) to (-4, 3) as C1, and the second line segment from (-4, 3) to (-8, 0) as C2.
For C1:
We can parametrize C1 as follows:
x(t) = -4t, y(t) = 3t, where t ranges from 0 to 1.
The differential elements dx and dy can be calculated as:
dx = x'(t) dt = -4 dt
dy = y'(t) dt = 3 dt
Substituting these into the line integral expression:
∫C1 (-4dy - 3dx)
= ∫₀¹ (-4(3 dt) - 3(-4 dt))
= ∫₀¹(12 dt + 12 dt)
= ∫₀¹ 24 dt
= 24 ∫₀¹ dt
= 24(t)₀¹
= 24(1 - 0)
= 24
For C2:
We can parametrize C2 as follows:
x(t) = -8t - 4, y(t) = -3t + 3, where t ranges from 0 to 1.
The differential elements dx and dy can be calculated as:
dx = x'(t) dt = -8 dt
dy = y'(t) dt = -3 dt
Substituting these into the line integral expression:
∫C2 (-4dy - 3dx)
= ∫₀¹ (-4(-3 dt) - 3(-8 dt))
= ∫₀¹ (12 dt + 24 dt)
= ∫₀¹ 36 dt
= 36∫₀¹ dt
= 36(t)₀¹
= 36(1 - 0) = 36
Therefore, the line integral along the curve C is the sum of the line integrals along C1 and C2:
∫C (-4dy - 3dx) = ∫C1 (-4dy - 3dx) + ∫C2 (-4dy - 3dx) = 24 + 36 = 60.
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Return to the setting of exercise 7.M.3. It turns out that Astiniu other chemicals, so getting the amount of Astinium close to the targe B D 100 А 100 If b = 100 is the desired amount of each chemical, and 6 is the amount we actually с 100 produce, then we desire to minimize the weighted sum of squares error 4(100 - A)2 + (100 – B)2 + (100 - C)2 + (100 - D)2 a) Define an inner product on R4 so that the weighted sum of squares error above is equal to 1|6 - 6|12 b) Write down the normal equation for this optimization problem (using the setup from 7.M.3) which determines the best amount of each process to run. c) Solve this normal equation. 7.M.3 I'm a chemist trying to produce four chemicals: Astinium, Bioctrin, Carnadine, and Dimerthorp. When I run Process 1, I produce one gram of Astinium, one gram of Bioctrin, 5 grams of Carna- dine, and 3 grams of Dimerthorp. When I run process 2, I produce 3 grams of Astinium, one gram of Bioctrin, one gram of Dimerthorp, and I consume one gram of Carnadine. My target is to produce 100 grams of all four chemicals. I know this is not precisely possible, but I want to get as close as possible (with a least squares error measurement). How many times should I run process 1 and process 2 (answers need not be whole numbers)?
(a) By defining an inner product on R^4 as the dot product, the weighted sum of squares error can be expressed as ||x - x'||^2, where x is the vector of amounts produced and x' is the vector of desired amounts.
To solve this optimization problem, we can follow these steps:
a) Define an inner product on [tex]R^4[/tex] so that the weighted sum of squares error is equal to [tex]||x - x'||^2[/tex], where x and x' are vectors in [tex]R^4.[/tex]
Let x = (A, B, C, D) be the vector of amounts produced in each process, and x' = (100, 100, 100, 100) be the vector of the desired amounts. We can define the inner product on R^4 as the dot product:
[tex](x, x') = Ax' + Bx' + Cx' + Dx' \\= A(100) + B(100) + C(100) + D(100) \\= 100(A + B + C + D)[/tex]
Now, the weighted sum of squares error can be written as:
[tex]4(100 - A)^2 + (100 - B)^2 + (100 - C)^2 + (100 - D)^2\\= 4(100^2 - 200A + A^2) + (100^2 - 200B + B^2) + (100^2 - 200C + C^2) + (100^2 - 200D + D^2)\\= 4(100^2) - 800A + 4A^2 + 100^2 - 200B + B^2 + 100^2 - 200C + C^2 + 100^2 - 200D + D^2\\= 40000 - 800A + 4A^2 + 10000 - 200B + B^2 + 10000 - 200C + C^2 + 10000 - 200D + D^2\\= 4A^2 + B^2 + C^2 + D^2 - 800A - 200B - 200C - 200D + 70000[/tex]
This expression can be rewritten as [tex]||x - x'||^2[/tex], where x = (A, B, C, D) and x' = (100, 100, 100, 100).
b) The normal equation for this optimization problem is given by:
[tex]∇(||x - x'||^2) = 0[/tex]
Taking the gradient (∇) of the expression from part (a) with respect to A, B, C, and D, we get:
[tex]∂(||x - x'||^2)/∂A = 8A - 800\\= 0\\∂(||x - x'||^2)/∂B = 2B - 200 \\= 0\\∂(||x - x'||^2)/∂C = 2C - 200 \\= 0\\∂(||x - x'||^2)/∂D = 2D - 200 \\= 0\\[/tex]
Solving these equations, we find:
A = 100
B = 100
C = 100
D = 100
c) The solution to the normal equation is A = 100, B = 100, C = 100, and D = 100. This means that running process 1 and process 2 once will result in producing 100 grams of each chemical, which is the closest we can get to the target of 100 grams for all four chemicals.
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814,821,825,837,836,853….
What comes next ?
Either :
847
852
869
870
The next number in the sequence could be 870.
To determine the next number in the sequence, let's analyze the differences between consecutive terms:
821 - 814 = 7
825 - 821 = 4
837 - 825 = 12
836 - 837 = -1
853 - 836 = 17
Looking at the differences, we can see that they are not following a clear pattern. Therefore, it is difficult to determine the next number in the sequence based solely on this information.
However, we can make an educated guess by observing the general trend of the sequence. It appears that the numbers are generally increasing, with some occasional fluctuations. Based on this observation, a plausible next number could be one that is slightly higher than the previous term.
Taking this into consideration, we can propose the following options as potential next numbers:
853 + 7 = 860
853 + 17 = 870
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Evaluate the integral ∫√4+x^3 dx as a power series and find its radius of convergence
The integral ∫√(4 + x^3) dx can be expressed as a power series using the binomial series expansion. The resulting series is 4^(1/2) * (x + (1/8)(x^4/4) - (3/128)(x^7/4^2) + ...). The radius of convergence for the power series is infinite, meaning that the series converges for all values of x.
To evaluate the integral, we first rewrite the integrand as (4 + x^3)^(1/2). Using the binomial series expansion, we expand (1 + x^3/4)^(1/2) into a series. Substituting this series back into the original integral, we obtain a power series representation for the integral.
The terms of the power series involve powers of (x^3/4), and to determine the radius of convergence, we apply the ratio test. Simplifying the ratio of successive terms, we find that the limit is 1/2. Since this limit is less than 1, the series converges for all values of x within a radius of convergence centered at x = 0. Therefore, the radius of convergence for the power series representation of the integral is infinite.
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uppose that w =exyz, x = 3u v, y = 3u – v, z = u2v. find ¶w ¶u and ¶w ¶v.
The partial derivatives are,
⇒ δw/δu = 3e^(xyz) (yz + xz + xyu^2)
⇒ δw/δv = e^(xyz) * (yz - xz + xyu^2)
Since we know that,
δw/δu = (δw/dx) (dx/du) + (δw/dy) (dy/du) + (δw/dz)(dz/du)
Now calculate the partial derivatives of w with respect to x, y, and z,
⇒ δw/dx = e^(xyz) y z δw/dy
= e^(xyz) x z δw/dz
= e^(xyz) x y
Calculate the partial derivatives of x, y, and z with respect to u,
dx/du = 3
dy/du = 3
dz/du = u²
Substituting these values, we get'
⇒ δw/δu = (e^(xyz) y z 3) + (e^(xyz) x z 3) + (e^(xyz) x y u^2)
⇒ δw/δu = 3e^(xyz) (yz + xz + xyu^2)
Next, let's calculate δw/δu.
⇒ δw/δu= (δw/dx) (dx/dv) + (δw/dy) (dy/dv) + (δw/dz) (dz/dv)
Again, let's start with the partial derivatives of w with respect to x, y, and z,
⇒δw/dx = e^(xyz) y z δw/dy
= e^(xyz) x z δw/dz
= e^(xyz) x y
Calculate the partial derivatives of x, y, and z with respect to v,
dx/dv = 1
dy/dv = -1
dz/dv = u²
Substituting these values, we get:
⇒ δw/δv = (e^(xyz) y z) + (e^(xyz) x z -1) + (e^(xyz) x y u²)
⇒ δw/δv = e^(xyz) (yz - xz + xyu^2)
So the final answers are:
⇒ δw/δu = 3e^(xyz) (yz + xz + xyu^2)
⇒ δw/δv = e^(xyz) * (yz - xz + xyu^2)
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A group of 20 students have been on holiday abroad and are returning to Norway. IN
group there are 7 who have bought too much alcohol on duty-free and none of them inform
the customs about it. Customs officers randomly select 5 people from these 20 students for control.
We let the variable X be the number of students among the 5 selected who have bought too much
alcohol.
a) What type of probability distribution does the variable X have? Write down the formula for the point probabilities
b) What is the probability that none of those checked have bought too much?
c) What is the probability that at least 3 of the 5 controlled students have bought for a lot?
d) What is the expected value and standard deviation of X?
e) What is the probability that only the third person being checked has bought too much?
a) The variable X follows a hypergeometric distribution. The formula for the point probabilities of the hypergeometric distribution is:
P(X = k) = (C(n1, k) * C(n2, r - k)) / C(N, r). C(n, k) represents the number of ways to choose k items from a set of n items (combination formula). n1 is the number of students who have bought too much alcohol (7 in this case). n2 is the number of students who have not bought too much alcohol (20 - 7 = 13). r is the number of students selected for control (5 in this case). N is the total number of students
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Choose The Simplified Form:
X²Y - 4xy² + 6x²Y + Xy / xy
To simplify the expression X²Y - 4xy² + 6x²Y + Xy / xy, we can simplify each term separately and then combine them.
Let's simplify each term:
X²Y/xy: The x in the denominator cancels out with one of the x's in the numerator, leaving X/Y.
-4xy²/xy: The xy in the numerator cancels out with the xy in the denominator, leaving -4y.
6x²Y/xy: The x in the denominator cancels out with one of the x's in the numerator, leaving 6xY/y, which simplifies to 6xY.
Xy/xy: The xy in the numerator cancels out with the xy in the denominator, leaving X/y.
Now, combining the simplified terms, we have:
(X/Y) - 4y + 6xY + (X/y).
To further simplify, we can combine like terms:
X/Y + (X/y) + 6xY - 4y.
So, the simplified form of the expression X²Y - 4xy² + 6x²Y + Xy / xy is X/Y + (X/y) + 6xY - 4y.
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Problem 4.4. Let X = (X₁,..., Xd)^T~ Nd(μ, Σ) for some μE R^d and d x d matrix Σ, and let A be a deterministic n x d matrix. Note that AX is a (random) vector in R". (a) Fix a € R". What is the probability distribution of a^T AX? (b) For 1 ≤ i ≤n, compute E((AX)i).
(c) For 1 ≤i, j≤n, compute Cov((AX)i, (AX)j). (d) Using (a), (b), and (c), determine the probability distribution of AX.
By calculating the mean vector and covariance matrix of AX using parts (a), (b), and (c), we can determine the probability distribution of AX as a multivariate normal distribution.
a) To determine the probability distribution of the random variable a^TAX, we need to consider the mean and covariance matrix of AX.
The mean of AX can be calculated as:
E(AX) = A * E(X)
The covariance matrix of AX can be calculated as:
Cov(AX) = A * Cov(X) * A^T
Using these formulas, we can determine the probability distribution of a^TAX by finding the mean and covariance matrix of a^TAX.
(b) For each i from 1 to n, E((AX)i) is the ith component of the mean vector E(AX).
It can be calculated as:
E((AX)i) = (A * E(X))i
(c) For each pair of i and j from 1 to n, Cov((AX)i, (AX)j) is the (i,j)th entry of the covariance matrix Cov(AX).
It can be calculated as:
Cov((AX)i, (AX)j) = (A * Cov(X) * A^T)ij
(d) To determine the probability distribution of AX, we need to know the mean vector and covariance matrix of AX.
Once we have these, we can conclude that AX follows a multivariate normal distribution, denoted as AX ~ N(μ', Σ'), where μ' is the mean vector of AX and Σ' is the covariance matrix of AX.
So, by calculating the mean vector and covariance matrix of AX using parts (a), (b), and (c), we can determine the probability distribution of AX as a multivariate normal distribution.
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Solve the following ordinary differential equation
9. y(lnx - In y)dx + (x ln x − x ln y − y)dy = 0
The given ordinary differential equation is a nonlinear equation. By using the integrating factor method, we can transform it into a separable equation. Solving the resulting separable equation leads to the general solution.
Let's analyze the given ordinary differential equation: y(lnx - In y)dx + (x ln x − x ln y − y)dy = 0. It is a nonlinear equation and cannot be easily solved. However, we can transform it into a separable equation by introducing an integrating factor. To determine the integrating factor, we observe that the coefficient of dy involves both x and y, while the coefficient of dx only involves x. Thus, we can choose the integrating factor as the reciprocal of x. Multiplying the entire equation by 1/x yields y(lnx - In y)dx/x + (ln x - ln y - y/x)dy = 0.
Now, the equation becomes separable, with terms involving x and terms involving y. By rearranging the equation, we have (ln x - ln y - y/x)dy = (In y - lnx)dx. Integrating both sides with respect to their respective variables, we obtain ∫(ln x - ln y - y/x)dy = ∫(In y - lnx)dx. After integrating, we get y(ln x - In y) = xy - x ln x + C, where C is the constant of integration.
This is the general solution to the given ordinary differential equation. It represents a family of curves that satisfy the equation. If any initial or boundary conditions are given, they can be used to determine the specific solution within the family of curves.
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. (A)Use induction to prove n∑(i=1) i^2 = (n(n + 1)(2n + 1))/6 for all natural numbers n.
(B). Given that f(x) = √x − 3, estimate integral from 1 to 6f(x) dx by calculating M5 and L5.
(C). Consider the area between the curve y = x^3 and the x-axis over the interval [0, 1] with four rectangles. Use a sketch to show how to obtain over and under estimates for the area using Riemann sums.
(A) Proof by induction: Step 1: Base Case For n = 1, we have: 1∑(i=1) i^2 = 1^2 = 1 = (1(1 + 1)(2(1) + 1))/6. The equation holds true for the base case.
Step 2: Inductive Step. Assume the equation holds true for some natural number k, i.e., k∑(i=1) i^2 = (k(k + 1)(2k + 1))/6. Now, we need to prove it for k + 1. (k + 1)∑(i=1) i^2 = (k + 1) + k∑(i=1) i^2. Using the assumption: (k + 1)∑(i=1) i^2 = (k + 1) + (k(k + 1)(2k + 1))/6. Simplifying: (k + 1)∑(i=1) i^2 = ((k + 1)(6) + (k(k + 1)(2k + 1)))/6. Factoring out (k + 1): (k + 1)∑(i=1) i^2 = (6(k + 1) + k(2k + 1)(k + 1))/6. Further simplification: (k + 1)∑(i=1) i^2 = (6(k + 1) + 2k^2(k + 1) + k(k + 1))/6. Combining like terms: (k + 1)∑(i=1) i^2 = (6(k + 1) + 2k^2(k + 1) + k^2 + k)/6
Factoring out common terms: (k + 1)∑(i=1) i^2 = (k^3 + 3k^2 + 2k + 6(k + 1))/6. Simplifying further: (k + 1)∑(i=1) i^2 = (k^3 + 3k^2 + 2k + 6k + 6)/6. Combining like terms: (k + 1)∑(i=1) i^2 = (k^3 + 3k^2 + 8k + 6)/6. Factoring out: (k + 1)∑(i=1) i^2 = (k + 1)(k^2 + 2k + 6)/6, (k + 1)∑(i=1) i^2 = (k + 1)((k + 1) + 1)(2(k + 1) + 1)/6. Therefore, the equation holds true for (k + 1). By the principle of mathematical induction, the equation n∑(i=1) i^2 = (n(n + 1)(2n + 1))/6 holds for all natural numbers n.
(B) To estimate the integral ∫[1, 6] f(x) dx using the Midpoint Rule (M5) and Left Endpoint Rule (L5), we need to divide the interval [1, 6] into five subintervals. M5 (Midpoint Rule): Δx = (6 - 1)/5 = 1, xi = 1 + (i - 1/2)Δx, for i = 1, 2, 3, 4, 5, f(xi) = √xi - 3. Approximation using M5: ∫[1, 6] f(x) dx ≈ Δx * [f(x1) + f(x2) + f(x3) + f(x4) + f(x5)]= 1 * [f(1.5) + f(2.5) + f(3.5) + f(4.5) + f(5.5)]. L5 (Left Endpoint Rule): Δx = (6 - 1)/5 = 1, xi = 1 + (i - 1)Δx, for i = 1, 2, 3, 4, 5 f(xi) = √xi - 3. Approximation using L5: ∫[1, 6] f(x) dx ≈ Δx * [f(x1) + f(x2) + f(x3) + f(x4) + f(x5)] = 1 * [f(1) + f(2) + f(3) + f(4) + f(5)]
(C) To obtain over and under estimates for the area between the curve y = x^3 and the x-axis over the interval [0, 1] using Riemann sums, we can use the left and right endpoint rules. Overestimate: Use the Right Endpoint Rule (Riemann sum). Divide the interval [0, 1] into n subintervals of equal width Δx = (1 - 0)/n. Approximation using Right Endpoint Rule: Overestimate = Δx * [f(x1) + f(x2) + f(x3) + ... + f(xn)]= Δx * [f(Δx) + f(2Δx) + f(3Δx) + ... + f(nΔx)]. Underestimate: Use the Left Endpoint Rule (Riemann sum). Approximation using Left Endpoint Rule: Underestimate = Δx * [f(0) + f(Δx) + f(2Δx) + ... + f((n-1)Δx)]. By increasing the value of n, we can improve the accuracy of both the overestimate and underestimate.
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Normal Distribution The time needed to complete a quiz in a particular college course is normally distributed with a mean of 160 minutes and a standard deviation of 25 minutes. What is the probability that a student will complete it in more than 100 minutes but less than 170 minutes? (
and Assume that the class has 120 students and that the time period is 180 minutes in length. How many students do you expect will not complete it in the allotted time?
working please
Solution :
μ = 160 minutes
standard deviation σ = 25 minutes
The formula for z-score is, z=(x-μ)/σ
To find the probability of the completion of a quiz in more than 100 minutes but less than 170 minutes, we need to find the z-score values for the given x values.
For x = 100, z = (100 - 160)/25 = -2.4
For x = 170, z = (170 - 160)/25 = 0.4
The probability that a student will complete it in more than 100 minutes but less than 170 minutes isP(100 < x < 170) = P(-2.4 < z < 0.4)
Using the standard normal table
we get P(-2.4 < z < 0.4) = 0.6554 - 0.0885 = 0.5669
The probability that a student will complete it in more than 100 minutes but less than 170 minutes is 0.5669.
Now, to find the number of students who will not complete it in the allotted time, we need to find the probability of the completion of the quiz in more than 180 minutes.
The z-score for x = 180 is z = (180 - 160)/25 = 0.8.
The probability of completion of the quiz in more than 180 minutes is P(x > 180) = P(z > 0.8)
Using the standard normal table, we get P(z > 0.8) = 1 - 0.7881 = 0.2119
So, the expected number of students who will not complete it in the allotted time is 120 × 0.2119 = 25.43 ≈ 25 students.
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(a) Let R* be the group of nonzero real numbers under multiplication. Then H = {x € RX | x2 is rational } is a subgroup of R*. =
H is a subgroup of R*. The given set H = {x € RX | x2is rational } is a subgroup of R*.
It is necessary to demonstrate that the subset H satisfies the requirements of the subgroup test. To begin, it must be verified that H is nonempty.
The identity element of R* is 1, and it is clear that 12 = 1, which is rational. As a result, H is nonempty. Let a, b ∈ H. It follows that a2 and b2 are both rational, so there exist integers p and q such that a2 = p/q and b2 = r/s, where p, q, r, and s are all integers and q and s are both nonzero. We have:(a * b)2 = a2 * b2 = p/q * r/s = pr/qsSince the product of two rational numbers is rational, it follows that ab is an element of H.The inverse of a is 1/a. Since (1/a)2 = 1/(a2) is rational, it follows that 1/a is an element of H.
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Solve the linear equation ru, + yuy+ zuz = 4u subject to the initial condit u(x, y, 1) = xy.
To solve the given linear equation, we'll use the method of separation of variables. The equation is: ru + yuy + zuz = 4u. We're also given the initial condition u(x, y, 1) = xy. Let's assume u(x, y, z) = X(x)Y(y)Z(z), where X(x), Y(y), and Z(z) are functions of their respective variables.
Substituting this into the equation, we have:
r(XYZ) + y(XY)(YZ) + z(XY)(YZ) = 4(XY)
Dividing both sides by XYZ, we get:
r/X + y/Y + z/Z = 4 Since the left side of the equation only depends on one variable, while the right side is a constant, both sides must be equal to a constant value, which we'll call -λ².
So we have the following three equations:
r/X = -λ² ...(1)
y/Y = -λ² ...(2)
z/Z = -λ² ...(3)
Now, let's substitute these solutions back into the assumption u(x, y, z) = XYZ:
u(x, y, z) = X(x)Y(y)Z(z)
= (-r/λ²)(-y/λ²)(-z/λ²)
= ryz/λ^6.
Finally, using the initial condition u(x, y, 1) = xy, we substitute the values:
u(x, y, 1) = r(1)(y)/(λ^6) = xy.
Simplifying, we get r/λ^6 = 1.
Therefore, the solution to the linear equation is u(x, y, z) = (λ^6)xyz, where λ is an arbitrary constant.
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Prove that an odd integer n > 1 is prime if and only if it is
not expressible as a sum of three or more consecutive positive
integers.
If n is a prime odd integer, it cannot be expressed as a sum of three or more consecutive positive integers.
If n is not expressible as a sum of three or more consecutive positive integers, then n is prime.
To prove that an odd integer n > 1 is prime if and only if it is not expressible as a sum of three or more consecutive positive integers, we need to demonstrate both directions of the statement.
Direction 1: If an odd integer n > 1 is prime, then it is not expressible as a sum of three or more consecutive positive integers.
Assume that n is a prime odd integer. We want to show that it cannot be expressed as the sum of three or more consecutive positive integers.
Let's suppose that n can be expressed as the sum of three consecutive positive integers: n = a + (a+1) + (a+2), where a is a positive integer.
Expanding the equation, we have: n = 3a + 3.
Since n is an odd integer, it cannot be divisible by 2. However, 3a + 3 is always divisible by 3. This implies that n cannot be expressed as the sum of three consecutive positive integers.
Therefore, if n is a prime odd integer, it cannot be expressed as a sum of three or more consecutive positive integers.
Direction 2: If an odd integer n > 1 is not expressible as a sum of three or more consecutive positive integers, then it is prime.
Assume that n is an odd integer that cannot be expressed as a sum of three or more consecutive positive integers. We want to show that n is prime.
Suppose, for the sake of contradiction, that n is not prime. This means that n can be factored into two positive integers, say a and b, such that n = a * b, where 1 < a ≤ b < n.
Since n is odd, both a and b must be odd. Let's express a and b as a = 2k + 1 and b = 2l + 1, where k and l are non-negative integers.
Substituting into the equation n = a * b, we have: n = (2k + 1)(2l + 1).
Expanding the equation, we get: n = 4kl + 2k + 2l + 1.
Since n is odd, it cannot be divisible by 2. However, the expression 4kl + 2k + 2l + 1 is always divisible by 2. This contradicts our assumption that n cannot be expressed as the sum of three or more consecutive positive integers.
Therefore, if n is not expressible as a sum of three or more consecutive positive integers, then n is prime.
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A researcher wants to measure people's exposure to the news media. In her survey, she asks respondents to indicate on how many days during the previous week they read a newspaper. The possible responses range from a minimum of "zero" days to a maximum of "seven" days. This is an example of a ratio scale or measure. O True O False
The measurement of responses that span from 1 to seven is an example of ratio scale or measure so, the statement is True.
What is a ratio scale?A ratio scale is a form of measurement that records the intervals between a series of measurements. The measurements starts from a true zero and proceeds to quantities with equal measurements.
The description of a ratio scale is as described in the researcher's results where respondents can give responses between 0 and 7 days. So, the statement above is true.
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For certain workers the man wage is 30 00th, with a standard deviation of S5 25 ta woher chosen at random what is the probably that he's 25 The pray is (Type an integer or n ded WE PREVEDE WHEY PRO 18
The answer is: 0.171 (rounded to three decimal places).
Given the mean wage = $30,000 and the standard deviation = $5,250. We need to find the probability of a worker earning less than $25,000.P(X < $25,000) = ?
The formula for calculating the z-score is given by: z = (X - μ) / σwhere, X = data valueμ = population meanσ = standard deviation
Substituting the given values, we get:z = (25,000 - 30,000) / 5,250z = -0.9524
We need to find the probability of a worker earning less than $25,000. We use the standard normal distribution table to find the probability.
The standard normal distribution table gives the area to the left of the z-score. P(Z < -0.9524) = 0.171
This means that there is a 0.171 probability that a randomly chosen worker earns less than $25,000.
Therefore, the answer is: 0.171 (rounded to three decimal places).
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For a science project, a student tested how long 16 samples of heavy-duty batteries would power a portable CD player. Here are the running times, in hours:
29, 26, 23, 22, 22, 17, 27, 25, 22, 22, 23, 22, 27, 23, 24, 26
a) Determine the range for these data.
b) Determine a reasonable interval size and the number of intervals.
c) Produce a frequency table for these data.
For a science project, a student tested how long 16 samples of alkaline batteries would power a CD player. Here are the results, in hours:
105, 140, 116, 140, 141, 143, 139, 149, 147, 108, 146, 142, 148, 125, 134, 140
a) Determine the range for these data.
b) Determine a reasonable interval size and the number of intervals.
c) Produce a frequency table for these data.
a) To determine the range for the first set of data (heavy-duty batteries), we subtract the smallest value from the largest value.
Range = Largest value - Smallest value
= 29 - 17
= 12 hours
b) To determine a reasonable interval size and the number of intervals, we can use the formula for determining the number of intervals in a histogram:
Number of intervals = √(Number of data points)
Number of intervals = √16
= 4
To determine the interval size, we divide the range by the number of intervals:
Interval size = Range / Number of intervals
= 12 / 4
= 3 hours
Therefore, a reasonable interval size for the heavy-duty batteries data is 3 hours, and we will have 4 intervals.
c) To produce a frequency table for the heavy-duty batteries data, we group the data into intervals and count the frequency (number of occurrences) of data points within each interval.
The intervals for the heavy-duty batteries data are:
[17-19), [20-22), [23-25), [26-28), [29-31)
Frequency table:
Interval Frequency
[17-19) 1
[20-22) 5
[23-25) 5
[26-28) 3
[29-31) 2
Now let's move on to the alkaline batteries data:
a) To determine the range for the alkaline batteries data, we subtract the smallest value from the largest value.
Range = Largest value - Smallest value
= 149 - 105
= 44 hours
b) To determine a reasonable interval size and the number of intervals, we can use the formula for determining the number of intervals in a histogram:
Number of intervals = √(Number of data points)
Number of intervals = √16
= 4
To determine the interval size, we divide the range by the number of intervals:
Interval size = Range / Number of intervals
= 44 / 4
= 11 hours
Therefore, a reasonable interval size for the alkaline batteries data is 11 hours, and we will have 4 intervals.
c) To produce a frequency table for the alkaline batteries data, we group the data into intervals and count the frequency (number of occurrences) of data points within each interval.
The intervals for the alkaline batteries data are:
[105-115), [116-126), [127-137), [138-148), [149-159)
Frequency table:
Interval Frequency
[105-115) 1
[116-126) 2
[127-137) 1
[138-148) 5
[149-159) 7
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what is the value of dealt s for the catalytic hydogenation of acetylene to ethane
The value of Δs for the catalytic hydrogenation of acetylene to ethane cannot be determined without specific information about the reaction conditions and stoichiometry.
The value of Δs (change in entropy) for the catalytic hydrogenation of acetylene to ethane cannot be determined without specific information about the reaction conditions and the stoichiometry of the reaction.
Entropy change is influenced by factors such as the number and types of molecules involved, the temperature and pressure conditions, and the overall reaction mechanism. Therefore, the value of Δs for this specific reaction would depend on the specific reaction conditions and would need to be determined experimentally or calculated using thermodynamic data.
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A candy company distributes boxes of chocolates with a mixture of creams, toffees, and cordials. Suppose that the weight of each box is 4 pounds, but the individual weights of the creams, toffees, and cordials vary from box to box For a randomly selected box let X and Y represent the weights of the creams and the toffees, respectively, and suppose that the joint density function of these variables is shown below.
f(x,y) = { 3/32xy, 0 ≤ x ≤ 4, 0 ≤ y ≤ 4, x + y ≤ 4
0, elsewhere
Find the probability that in a given box the cordials account for more than 1/3 of the weight.
To find the probability that the cordials account for more than 1/3 of the weight in a given box, we need to integrate the joint density function over the region where the cordials' weight exceeds 1/3 of the total weight.
Let Z represent the weight of the cordials. We want to find P(Z > 1/3).
The weight of the creams and toffees can be calculated as W = X + Y. From the given information, we know that the total weight of the box is 4 pounds. Therefore, Z = 4 - W.
To find the probability P(Z > 1/3), we need to evaluate the double integral of the joint density function over the region where Z > 1/3. This region can be determined by considering the conditions 0 ≤ X ≤ 4, 0 ≤ Y ≤ 4, X + Y ≤ 4, and Z > 1/3.
The integral can be set up as follows:
P(Z > 1/3) = ∫∫[f(X, Y)] dX dY
However, calculating this integral requires integrating over different regions based on the values of X and Y that satisfy the conditions. This involves breaking up the region into multiple subregions and evaluating separate integrals for each subregion.
Since the exact integrals and boundaries can be complex to determine without specific values for the joint density function, it is advisable to use numerical methods or software tools to approximate the probability P(Z > 1/3) based on the given joint density function.
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For safety reasons, highway bridges throughout the state are rated for the "gross weight" of trucks that are permitted to drive across the bridge. For a certain bridge upstate, the probability is 30% that a truck which is pulled over by State Police for a random safety check is found to exceed the "gross weight" rating of the bridge. Suppose 15 trucks are pulled today by the State Police for a random safety check of their gross weight a) Find the probability that exactly 5 of the trucks pulled over today are found to exceed the gross weight rating of the bridge. Express your solution symbolically, then solve to 8 decimal places. Show All Work! b) Find the probability that the 10th truck pulled over today is the 4th truck found to exceed the gross weight rating of the bridge. Express your solution symbolically, then solve to 8 decimal places. Show All Work!
(a) the probability that exactly 5 of the trucks pulled over today are found to exceed the gross weight rating of the bridge is P(5) = 0.0057299691. (b) P = 0.075162792
a) The binomial probability distribution formula for x successes in n trials, with probability of success p on a single trial, is
P(x) = (nC₋x) * p^x * q^(n-x)
where q = 1-p is the probability of failure on a single trial, and nC₋x is the binomial coefficient.
P(5) = (15C₋5) * (0.30)^5 * (0.70)^10
P(5) = (3003) * (0.30)^5 * (0.70)^10
P(5) = 0.0057299691, to 8 decimal places.
For a binomial distribution with n trials, the formula P(x) = (nCx) * p^x * q^(n-x) is used to determine the probability of getting x successes in n trials. For a certain bridge upstate, the probability is 30% that a truck which is pulled over by State Police for a random safety check is found to exceed the "gross weight" rating of the bridge. Suppose 15 trucks are pulled today by the State Police for a random safety check of their gross weight.
To find the probability that exactly 5 of the trucks pulled over today are found to exceed the gross weight rating of the bridge, we use the binomial probability distribution formula:
P(5) = (15C₋5) * (0.30)^5 * (0.70)^10
P(5) = 0.0057299691, to 8 decimal places.
b) The probability of getting the 4th truck that exceeds the gross weight rating of the bridge on the 10th pull is the same as getting 3 trucks in the first 9 pulls and then the 4th truck on the 10th pull. Hence, we use the binomial probability distribution formula with n = 9, x = 3, and p = 0.30 to find the probability of getting 3 trucks that exceed the gross weight rating in the first 9 pulls:
P(3) = (9C₋3) * (0.30)^3 * (0.70)^6
P(3) = 0.25054264
We then multiply this probability by the probability of getting a truck that exceeds the gross weight rating of the bridge on the 10th pull, which is 0.30:
P = 0.25054264 * 0.30
P = 0.075162792, to 8 decimal places.
P(5) = 0.0057299691
P = 0.075162792
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Evaluate the integral: √16x² - 1/x² dx, x > 1/4. Begin by letting x = 1/4 sec 0, where 0 ≤0 < 1/1. Credit will not be given for any other method. Your final answer must be in terms of x and must not include any trigonometric functions or their inverses.
To evaluate the integral √(16x² - 1/x²) dx, where x > 1/4, we can start by letting x = 1/4 sec θ, where 0 ≤ θ < 1/1. Credit will only be given for using this method. The final answer:
(1/6) tan³(1/4 sec⁻¹(x)) - (1/2) ln|sec(1/4 sec⁻¹(x)) + tan(1/4 sec⁻¹(x))| + C
Let's begin by substituting x = 1/4 sec θ into the integral. The differential dx can be expressed as dx = (1/4) sec θ tan θ dθ. Substituting these values, we have:
∫√(16x² - 1/x²) dx = ∫√(16(1/4 sec θ)² - 1/(1/4 sec θ)²) (1/4 sec θ tan θ) dθ
Simplifying the expression under the square root gives us:
∫√(4sec²θ - 16) (1/4 sec θ tan θ) dθ
Simplifying further, we get:
∫√(4tan²θ) (1/4 sec θ tan θ) dθ = ∫2 tan θ (1/4 sec θ tan θ) dθ = (1/2) ∫tan²θ sec θ dθ
To proceed, we can make use of a trigonometric identity: tan²θ + 1 = sec²θ. Rearranging this equation gives us: tan²θ = sec²θ - 1. Substituting this into the integral, we have:
(1/2) ∫(sec²θ - 1) sec θ dθ = (1/2) ∫sec³θ - sec θ dθ
Integrating term by term, we obtain:
(1/2) * (1/3) tan³θ - (1/2) ln|sec θ + tan θ| + C
Finally, substituting back θ = 1/4 sec⁻¹(x), we arrive at the final answer:
(1/6) tan³(1/4 sec⁻¹(x)) - (1/2) ln|sec(1/4 sec⁻¹(x)) + tan(1/4 sec⁻¹(x))| + C
This expression represents the evaluated integral in terms of x, fulfilling the requirements stated in the problem.
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A soup can has a diameter of 2 inches and a height of 32 inches. 8 4 How many square inches of paper are required to make the label on the soup can?
To create the label for the soup can, we would require an estimated area of 64π square inches of paper.
To make the label on the soup can, we need to determine the amount of square inches of paper required. We need to find the surface area of the can, which consists of the lateral surface area of the cylinder.
The label on the soup can can be thought of as a rectangle that wraps around the surface of the can. To calculate the area of the label, we need to find the surface area of the can, which consists of the lateral surface area of the cylinder.
The formula for the lateral surface area of a cylinder is given by A = 2πrh, where r is the radius of the base and h is the height of the cylinder.
Given that the diameter of the can is 2 inches, the radius (r) is half of the diameter, which is 1 inch. The height (h) of the can is 32 inches.
Substituting the values into the formula, we have A = 2π(1)(32) = 64π square inches.
Therefore, to make the label on the soup can, we would need approximately 64π square inches of paper.
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Find the eigenfunctions for the following boundary value problem.
x²y" − 13xy' + (49 +A) y = 0, y(e¯¹) = 0, y(1) = 0.
n the eigenfunction take the arbitrary constant (either c₁ or c₂) from the general solution to be 1.
To find the eigenfunctions for the given boundary value problem, let's solve the differential equation using the method of separation of variables.
We have the differential equation:
x^2y" - 13xy' + (49 + A)y = 0
First, let's assume a solution of the form y(x) = x^r, where r is a constant to be determined.
Taking the first and second derivatives of y(x):
y' = rx^(r-1)
y" = r(r-1)x^(r-2)
Substituting these derivatives into the differential equation, we get:
x^2(r(r-1)x^(r-2)) - 13x(rx^(r-1)) + (49 + A)x^r = 0
Simplifying:
r(r-1)x^r - 13rx^r + (49 + A)x^r = 0
Factoring out x^r:
x^r(r(r-1) - 13r + 49 + A) = 0
For a non-trivial solution, the expression in parentheses must equal zero:
r(r-1) - 13r + 49 + A = 0
Simplifying the quadratic equation:
r^2 - r - 13r + 49 + A = 0
r^2 - 14r + 49 + A = 0
To find the values of r that satisfy this equation, we can use the quadratic formula:
r = (-b ± √(b^2 - 4ac)) / (2a)
Applying the formula:
r = (14 ± √(196 - 4(49 + A))) / 2
r = (14 ± √(196 - 196 - 4A)) / 2
r = (14 ± √(-4A)) / 2
r = 7 ± √(-A)
Since we are looking for real eigenfunctions, √(-A) must be a real number. This means A must be negative, i.e., A < 0.
Now, let's find the eigenfunctions based on the values of r.
For r = 7 + √(-A):
y₁(x) = x^(7 + √(-A))
For r = 7 - √(-A):
y₂(x) = x^(7 - √(-A))
Note: We set one of the arbitrary constants to 1, as instructed.
These functions y₁(x) and y₂(x) represent the eigenfunctions for the given boundary value problem when A < 0.
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Consider the matrices and find the following computations, if possible. [3-2 1 5 07 A= = D.)B-11-3.).C-6 2.0.0-42 ] 1 3 5 6 В : TO -25 2 C D 9 0 4 1 1 2 5 7 3 D = 1 F = 8 E - 7 3 -7 2 9 8 2 (a) 2E-3F (b) (2A +3D)T (c) A² (d) BE (e) CTD (f) BA
We cannot compute the product BA.
The given matrices are: A = [3 -2 1; 5 0 7; 0 7 -2]
B = [1 3 5 6; -2 5 2 -2]
C = [-6 2; 0 0; -4 2]
D = [9 0 4; 1 1 2; 5 7 3]
E = [1 -7 3; -7 2 9; 8 2 1]
F = [8]
(a) 2E-3F
= 2 [1 -7 3; -7 2 9; 8 2 1] - 3 [8]
= [2 -14 6; -14 4 18; 16 4 2] - [24]
= [2 -14 6; -14 4 18; 16 4 -22]
(b) (2A + 3D)T = (2 [3 -2 1; 5 0 7; 0 7 -2] + 3 [9 0 4; 1 1 2; 5 7 3])T
= ([6 -4 2; 10 0 14; 0 21 -6] + [27 3 12; 3 3 6; 15 21 9])T
= [33 6 14; 13 3 20; 15 42 3]T
= [33 13 15; 6 3 42; 14 20 3]
(c) A² = [3 -2 1; 5 0 7; 0 7 -2] [3 -2 1; 5 0 7; 0 7 -2]
= [9 + 4 + 0 -6 -10 + 7 3 + 35 - 4; 15 + 0 + 7 25 + 0 + 49 0 + 0 - 14 + 7; 0 + 0 + 0 0 + 49 - 14 0 + 49 + 4]
= [13 -9 34; 22 35 -7; 0 49 53]
(d) BE = [1 3 5 6; -2 5 2 -2] [1 -7 3; -7 2 9; 8 2 1]
= [1(-8) + 3(-7) + 5(8) + 6(1) 1(-49) + 3(2) + 5(2) + 6(-7) 1(21) + 3(9) + 5(1) + 6(3) 1(-7) + (-2)(-7) + 2(2) + (-2)(9)]
= [-20 -39 50 0; 5 24 -11 -22]
(e) CTD = [-6 2; 0 0; -4 2] [9 0 4; 1 1 2; 5 7 3] [1 3 5 6; -2 5 2 -2]
= [-6(9) + 2(1) 2(3) + 0(5) + 2(6) -6(4) + 2(2) 0(9) + 0(1) + 0(5) 0(9) + 0(1) + 0(5) + 0
(6); 0 0 0 0; -4(9) + 2(-2) 2(3) + 0(5) + 2(6) -4(4) + 2(2) 0(9) + 0(1) + 0(5) 0(9) + 0(1) + 0(5) + 0(6)]
= [-54 20 2 -26; 0 0 0 0; -38 20 -12 -14]
(f) BA is not defined since the number of columns of A and the number of rows of B are not the same. Therefore, we cannot compute the product BA.
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An insurance company knows that in the entire population of millions of apartment owners, the mean annual loss from damage is μ = $130 and the standard deviation of the loss is o = $300. The distribution of losses is strongly right-skewed, i.e., most policies have $0 loss, but a few have large losses. If the company sells 10,000 policies, can it safely base its rates on the assumption that its average loss will be no greater than $135? Find the probability that the average loss is no greater than $135 to make your argument.
It is less likely that insurance company can safely assume that its average loss will be no greater than $135, the probability that average-loss is no greater than $135 to make argument is 0.0475.
To determine whether the insurance company can safely base its rates on the assumption that the average loss will be no greater than $135, we calculate the probability that the average-loss is within this range.
The average loss follows a normal distribution with a mean equal to the population mean and a standard deviation equal to the population standard deviation divided by the square root of the sample size.
The Population mean (μ) = $130
Population standard deviation (σ) = $300
Sample-size (n) = 10,000
To calculate the probability, we use the formula for sampling-distribution of sample-mean,
Sampling mean (μ') = Population-mean = $130
Sampling standard deviation (σ') = (Population standard deviation)/√(sample-size)
= $300/√(10,000) = $300/100 = $3,
Now, we find the probability that average loss (μ') is no greater than $135, which can be calculated using Z-Score and the standard normal distribution.
Z-score = (x - μ')/σ' = ($135 - $130)/$3
= $5/$3
≈ 1.67
P(x' > 135) = 1 - P(Z<1.67)
= 1 - 0.9525
= 0.0475.
Therefore, the probability that the average loss is no greater than $135 is approximately 0.0475.
Based on this calculation, it is less-likely that the insurance company can safely assume that its average loss will be no greater than $135.
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The doubling period of a bacterial population that is growing exponentially is 15 minutes. At time t = 80 minutes, the bacterial population was 90000. What was the initial population at time t = 0? Fi
Population is the total number of members of a specific species or group that are present in a given area or region at any given moment. It is a key idea in demography and is frequently used in a number of disciplines, including ecology, sociology, economics, and public health.
Let P be the initial population at time t = 0. The initial population at time t = 0 = PThe doubling time of bacterial population, t = 15 minutes.
The doubling period is the time it takes for the population to double its size, which is 15 minutes. So, at t = 15, the population size will become 2P.
Likewise, at t = 45, the population size will become
2(4P) = 8P. At t = 60, the population size will become
2(8P) = 16P. At t = 75, the population size will become
2(16P) = 32P. At t = 80, the population size will become
2(32P) = 64P, because 5 times the doubling period has passed. The population size at t = 80 is 90000. Therefore,
64P = 90000 ÷ 1.40625 = 63920.
64P = 63920P = 1000. Therefore, the initial population at time t = 0 was 1000.
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