An airliner carries 50 passengers and has doors with a height of 70 in. Heights of men are normally distributed with a mean of 69. 0 in and a standard deviation of 2. 8 in. Complete parts​ (a) through​ (d). A. If a male passenger is randomly​ selected, find the probability that he can fit through the doorway without bending. The probability is 0. 6406. ​(Round to four decimal places as​ needed. ) b. If half of the 50 passengers are​ men, find the probability that the mean height of the 25 men is less than 70 in. The probability is 0. 9633. ​(Round to four decimal places as​ needed. )

The Moon orbits Earth its position relative to the Sun changes causing different portions of the Moon's surface to be illuminated.

This creates predictable cyclic patterns, such as the phases of the Moon.

The Moon reflects sunlight as it orbits Earth due to its surface features, which include mountains, valleys, and craters.

These features scatter and reflect sunlight in different directions.

And causing the Moon to appear differently lit depending on its position relative to the Sun and Earth.

The phases of the Moon are determined by the amount of sunlight that is reflected from its surface as it orbits Earth.

When the Moon is between the Sun and Earth, its illuminated side faces away from Earth.

And causing the Moon to appear dark, known as a new moon.

As the Moon moves in its orbit, more and more of its illuminated side becomes visible from Earth.

And causing the Moon to appear to grow in size and brightness.

Until it reaches a full moon when the entire illuminated side is visible.

The cycle then repeats as the Moon moves in its orbit.

And causing the amount of illuminated surface visible from Earth to decrease until it reaches another new moon.

This cyclic pattern of changing illumination creates the predictable phases of the Moon that can be observed from Earth.

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The perimeter of the red rectangular tile is approximately 28.66 inches.

Since the blue and red rectangular tiles are similar, their corresponding sides are proportional. Let's find the scale factor between them.

The blue tile has a perimeter of 30 inches and a length of 10 inches. We know that the perimeter of a rectangle is the sum of all its sides, so we can write:

30 = 2L + 2W

where L is the length and W is the width. Since we have a rectangular tile, we know that L = 10 and we can solve for W:

30 = 2(10) + 2W
30 = 20 + 2W
10 = 2W
W = 5

So the blue tile has a width of 5 inches. Now we can find the scale factor between the blue and red tiles:

scale factor = length of blue tile / length of red tile
scale factor = 10 / 6
scale factor = 5/3

This means that the corresponding sides of the red tile are 5/3 times smaller than the corresponding sides of the blue tile. So if the blue tile has a width of 5 inches, the red tile has a width of:

width of red tile = (5/3) * (width of blue tile)
width of red tile = (5/3) * 5
width of red tile = 8.33 inches (rounded to two decimal places)

Now we can find the perimeter of the red tile:

perimeter of red tile = 2L + 2W
perimeter of red tile = 2(6) + 2(8.33)
perimeter of red tile = 12 + 16.66
perimeter of red tile = 28.66 inches (rounded to two decimal places)

So the perimeter of the red rectangular tile is approximately 28.66 inches.

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The new coordinates of the image include the following:

W' (-1, 1)

X' (4, -1)

Y' (4, -5)

Z' (1, -7)

In Mathematics and Geometry, a reflection over or across the x-axis is represented by this transformation rule (x, y) → (x, -y). This ultimately implies that, a reflection over or across the x-axis would maintain the same x-coordinate while the sign of the y-coordinate changes from positive to negative or negative to positive.

Next, we would apply a reflection over or across the x-axis to quadrilateral WXYZ;

(x, y)                →      (x, -y)

W (-1, -1)         →      (-1, -(-1)) = W' (-1, 1)

X (4, 1)           →      (4, -(1)) = X' (4, -1)

Y (4, 5)         →      (4, -(5)) = Y' (4, -5)

Z (1, 7)         →      (1, -(7)) = Z' (1, -7)

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Complete Question:

Quadrilateral WXYZ with vertices W (-1,-1), X (4,1), Y (4,5) and Z (1,7) reflected over the x-axis. What are the new coordinates of the image?

The given percent, 75% of all students at a school in favor of more bicycle parking spaces on campus, is a statistic because it represents a sample (all students at a school) and not the entire population.

A parameter would be the percentage of all students in favor of more bicycle parking spaces in all schools across the country.

The given percent, 75% of all students at a school being in favor of more bicycle parking spaces on campus, is a parameter. This is because it represents a characteristic of the entire population (all students at the school) rather than a sample.

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Answer:

The denominator will be x(x - 3).

The numerator will be -4x^2 + c, where c is any constant.

y = (-4x^2 + c)/(x(x - 3)).

Answer:

The answer would be 64%

Step-by-step explanation:

The concept used here is the fundamental concept is that someone will nearly surely occur. Meaning (favorable event/ total event)

Step 1: There are 25 total marbles because.

2+4+10+9=25

Step 2: Subtract the favorable event from the whole.

25/25-9/25= 16/25

Step 3: Rewrite as a percentage

1.00-0.36=

0.64

Step 4: Answer

64%

Using a 35-bag sample with a mean of 406.0 grams, a known standard deviation of 25.0 grams, and a level of significance of 0.05, you can perform a one-tailed Z-test to determine whether to reject or fail to reject the null hypothesis.

To test if the potato chip manufacturer's bag filling machine is working correctly at the 411.0-gram setting, we will state the hypotheses using the given terms.

Null Hypothesis (H0): The machine fills bags correctly, with a mean weight of 411.0 grams (µ = 411.0 grams)
Alternative Hypothesis (H1): The machine is underfilling bags, with a mean weight less than 411.0 grams (µ < 411.0 grams)

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The slope of the least squares regression line answer is (b) approx -140.00.

The slope of the least squares regression line can be calculated using the formula:

slope = (nΣ(xy) - ΣxΣy) / (nΣ(x^2) - (Σx)^2)

Where n is the number of data points (in this case, n = 9), Σ means "sum of", x and y represent the square footage and price data, respectively, and x^2 represents the square of the square footage.

Using the provided data, we can calculate:

Σx = 229
Σy = 2388
Σxy = 72192
Σ(x^2) = 72766

Substituting these values into the formula, we get:

slope = (9(72192) - (229)(2388)) / (9(72766) - (229)^2)
slope = -140.00 (rounded to two decimal places)

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The two possible values of the focal length are 1/4 and the distances from the vertex to the focus are either |5/4 - 1| = 1/2 or |7/4 - 3| = 1/2.

A parabola is a geometric shape that is defined as the set of all points that are equidistant from a fixed point called the focus and a fixed line called the directrix. A parabola is a type of conic section, and it is a symmetrical curve with a U-shape. The vertex is the point on the parabola where the curve changes direction, and it is equidistant from the focus and the directrix.

To find the x-intercepts, we set y = 0 and solve for x:

0 = x² - 4x + 3

Using the quadratic formula, we get:

x = (4 ± √4² - 4(1)(3)) / 2(1)

x = (4 ± √4) / 2

x = 2 ± 1

Therefore, the x-intercepts are (1, 0) and (3, 0).

To find the y-intercept, we set x = 0 and solve for y:

y = 0² - 4(0) + 3

y = 3

Therefore, the y-intercept is (0, 3).

The focal length of a parabola is equal to one-fourth of the absolute value of the coefficient of the squared term. In this case, the coefficient of x² is 1, so the focal length is 1/4.

Using the x-intercepts, we can find the distance between the vertex and the focus, which is also equal to one-fourth of the focal length. Let (h, k) be the vertex of the parabola. Then the distance between the vertex and the x-intercepts is |h - 1| = |h - 3|. Setting this equal to the focal length gives:

|h - 1| = |h - 3| = 1/4

Solving this system of equations gives two possible values for h:

h = 5/4 or h = 7/4.

Therefore, the two possible values of the focal length are 1/4 and the distances from the vertex to the focus are either |5/4 - 1| = 1/2 or |7/4 - 3| = 1/2.

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Complete Question:

Consider the parabolic equation y = x² - 4x + 3. Find the x and y intercepts of the graph of this equation and use them to determine two possible values of the focal length.

The solution to the differential equation x″ - x = ( [tex]t^{2}[/tex] - 1)u(t-1) is (1/2) * ( [tex]t^{2}[/tex]  - 2t + 3) * u(t) + (1/2) * [tex](t-1)^{3}[/tex] * u(t-1) + u(t-1).

To solve the differential equation x″ - x = ( [tex]t^{2}[/tex]  - 1)u(t-1) using Laplace transforms, we first take the Laplace transform of both sides of the equation:

L{x″ - x} = L{( [tex]t^{2}[/tex]  - 1)u(t-1)}

Using the properties of Laplace transforms and the fact that L{u(t-a)} = e^(-as)/s, we get:

[tex]s^{2}[/tex] X(s) - s x(0) - x'(0) - X(s) = (1/[tex]s^{3}[/tex]) * ([tex]e^{-s}[/tex] / s) * ( [tex]t^{2}[/tex]  - 1)

Substituting x(0) = 1 and x'(0) = 2, and simplifying the right-hand side using partial fractions, we get:

([tex]s^{2}[/tex]  - 1) X(s) = (1/[tex]s^{3}[/tex]) * [tex]e^{-s}[/tex]  - (1/s) - (1/[tex]s^{2}[/tex]) + [tex](1/s-1)^{3}[/tex]

Multiplying both sides by the inverse Laplace transform of ([tex]s^{2}[/tex] - 1), which is [tex]d^{2}[/tex]/d[tex]t^{2}[/tex] - 1, we get:

x''(t) - x(t) = (1/2) *  [tex]t^{2}[/tex]  - (3/2) * u(t-1) + (1/2) * [tex](t-1)^{2}[/tex] * u(t-1) + u(t-1)

Taking the inverse Laplace transform of X(s) using partial fractions and the Laplace transform table, we get:

x(t) = (1/2) * ( [tex]t^{2}[/tex]  - 2t + 3) * u(t) + (1/2) * [tex](t-1)^{3}[/tex] * u(t-1) + u(t-1)

Therefore, the solution to the differential equation x″ - x = ( [tex]t^{2}[/tex]  - 1)u(t-1) with initial conditions x(0) = 1 and x′(0) = 2 is:

x(t) = (1/2) * ( [tex]t^{2}[/tex]  - 2t + 3) * u(t) + (1/2) * [tex](t-1)^{3}[/tex] * u(t-1) + u(t-1)

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Answer:

a) 2.5 x 10^5

b) 8.1 x 10^4

c) 9.06 x 10^8

d) 1.034 x 10^10

Data value is multiplied by a positive number, the shape and spread of the distribution change while the center remains the same.

Multiplying each data value by a number greater than 1 will stretch the distribution, making it wider, while multiplying each data value by a number between 0 and 1 will compress the distribution, making it narrower.

Data value in a distribution is transformed linearly by multiplying or dividing each value by a number, the shape and spread of the distribution may change, the center of the distribution remains unchanged.

This happens because multiplication by a number changes the scale of the data.

As a result, the range and variability of the data change in proportion to the scaling factor.

Similarly, if each data value is divided by a positive number, the shape and spread of the distribution change while the center remains the same. Dividing each data value by a number greater than 1 will compress the distribution, making it narrower, while dividing each data value by a number between 0 and 1 will stretch the distribution, making it wider. This happens because division by a number changes the scale of the data in the opposite direction to multiplication.

It's important to note that if the number by which each data value is multiplied or divided is negative, then the distribution will be reflected around the mean, making it mirror image of the original distribution.

Overall, transforming a distribution linearly by multiplying or dividing each data value by a number can change the shape and spread of the distribution while leaving the center unchanged.

It's important to consider the impact of such transformations when interpreting the data and drawing conclusions from the distribution.

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The total length of craft wire used by Samantha is 10x + 9

What is the scale factor?

A scale factor is defined as the ratio between the scale of a given original object and a new object, which is its representation but of a different size (bigger or smaller).

Let's call the length of the smaller quadrilateral's 6-centimeter side "x".

Then the length of the corresponding side in the larger quadrilateral would be 6+3=9 centimeters, since the scale factor is 3.

To find the total length of craft wire used, we need to add up the lengths of all the sides in both quadrilaterals.

The smaller quadrilateral has four sides, each with a length of x.

The larger quadrilateral also has four sides, but only one of them has a different length (9 cm), while the other three sides are simply 3 times longer than the corresponding sides in the smaller quadrilateral.

So the total length of craft wire used by Samantha is:

4x + 9 + 3x + 3x + 3x

Simplifying this expression, we get:

10x + 9

Hence,  the total length of craft wire used by Samantha is:

10x + 9

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Answer:

6

Step-by-step explanation:

substitute t and u with the number

15-9= 6

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Answer:

6

Step-by-step explanation:

If t = 15 and u = 9, then:

[tex]\large \textsf{$t-u = 15-9$}\\ \large \textsf{$\phantom{t-u}=6$}[/tex]

Thus, the answer is 6

To determine how many different values appear in both lists, you can use a set intersection.

Here's how you can do it in Python:

list1 = [10, 10, 20, 30, 40, 50, 60]

list2 = [20, 20, 40, 60, 80]

set1 = set(list1)

set2 = set(list2)

common_values = set1.intersection(set2)

print(len(common_values))  # Output: 3

In this code, we first convert each list to a set using the set() function. This eliminates any duplicate values in the list, leaving us with only the distinct values. We then use the intersection() method of set to get the common values between the two sets.

Finally, we use the len() function to determine the number of common values and print it out.

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Answer:

The answer to your problem is, D. The second card is the better choice because the daily periodic interest on the first card is 0.041%, compared to 0.038% on the second card.

Step-by-step explanation:

Our daily periodic rate is = [tex]\frac{APR}{365}[/tex] %

For the first card it can be represented as, ( daily periodic rate equaling )

[tex]\frac{14.99}{365}[/tex] = 0.041%.

For the second it can be represented as, ( daily periodic rate equaling )

0.038%. We know because it can be given.

Compare them; 0.041% > 0.038% ( by 0.003% )

Making Option D correct.

Thus the answer to your problem is, D. The second card is the better choice because the daily periodic interest on the first card is 0.041%, compared to 0.038% on the second card.

Jada's initial deposit was approximately $14,000.21.

To solve this problem, we can use the formula for compound interest:

A = P(1 + r/n)^(nt)

where A is the final amount, P is the principal (initial deposit), r is the annual interest rate, n is the number of times the interest is compounded per year, and t is the time in years.

In this case, we know that Jada deposited some amount of money (P) 5 years ago and that the bank has been paying interest at a rate of 6% per year compounded daily (365 times per year). We also know that she now has $21,000 on deposit.

Using the formula above, we can solve for P:

21,000 = P(1 + 0.06/365)^(365*5)

21,000 = P(1.0618)^1825

P = 21,000 / (1.0618)^1825

P ≈ $14,000.21

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The problem you're asking about is to create an algorithm that computes x^n, given a real number x and an integer n, in O(log n) time complexity. The solution to this problem is the "Exponentiation by Squaring" algorithm.

Here's a concise explanation of the algorithm in 150 words:

Exponentiation by Squaring is an efficient algorithm that calculates x^n using a divide and conquer approach, which takes advantage of the fact that x^n = (x^2)^(n/2) if n is even, and x^n = x * x^(n-1) if n is odd. The algorithm computes the result recursively or iteratively, and its time complexity is O(log n), making it efficient for large exponents.

To handle negative exponents, we can use the property x^(-n) = 1 / x^n. So, if the given exponent n is negative, we can calculate the reciprocal of x and use the positive value of n in the algorithm. For the base case, when n = 0, the result is always 1, since any non-zero number raised to the power of 0 equals 1.

By using Exponentiation by Squaring, we can quickly compute x^n for any real number x and any positive or negative integer n, in O(log n) time.

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a. To simulate the amount you have to pay for damages to your car, we can use the following Excel formula in cell A1:

`=MAX(3000*NORMINV(RAND(), 0.025, 0.75)-1000, 0)`

b. We can then use the following formula in cell C1 to calculate the amount you have to pay for each combination of deductible amount and accident:

`=MAX(3000*NORMINV(RAND(), 0.025, 0.75)-B1, 0)`

c. It may not be reasonable to assume that damage amounts are normally distributed, since they may have a lower bound at zero and a skewed distribution with a longer tail on the positive side.

The standard deviation (SD, also written as the Greek symbol sigma or the Latin letter s) is a statistic that is used to express how much a group of data values vary from one another.

a. To simulate the amount you have to pay for damages to your car, we can use the following Excel formula in cell A1:

`=MAX(3000*NORMINV(RAND(), 0.025, 0.75)-1000, 0)`

This formula generates a random value from a normal distribution with mean 3000 and standard deviation 750, using the RAND() function to generate a random probability between 0 and 1, and the NORMINV() function to convert it into a normal deviate. If the value generated is less than 1000, it is set to 0, since you pay the first $1000 out of your pocket. Otherwise, the value is reduced by 1000, since you pay the deductible and the insurance pays the rest. We can copy this formula down 5000 rows to simulate 5000 iterations.

To find the average amount you pay, the standard deviation of the amounts you pay, and a 95% confidence interval for the average amount you pay, we can use the following Excel formulas:

- Average: `=AVERAGE(A1:A5000)`

- Standard deviation: `=STDEV(A1:A5000)`

- 95% confidence interval: `=CONFIDENCE.NORM(0.05, STDEV(A1:A5000), 5000)⁰·⁵`

These formulas calculate the sample mean, sample standard deviation, and 95% confidence interval for the sample mean, using the values generated by the simulation in column A.

b. To create a two-way data table, we can vary the deductible amount from $500 to $2000 in multiples of $500 by entering these values in cells B1:B5. We can then use the following formula in cell C1 to calculate the amount you have to pay for each combination of deductible amount and accident:

`=MAX(3000*NORMINV(RAND(), 0.025, 0.75)-B1, 0)`

We can copy this formula across cells C2:C5 and then down cells A2:A6 to generate a table of 25 values.

To find the average amount you pay, the standard deviation of the amounts you pay, and a 95% confidence interval for the average amount you pay for each deductible amount, we can use the following Excel formulas:

- Average: `=AVERAGE(A2:A6)`

- Standard deviation: `=STDEV(A2:A6)`

- 95% confidence interval: `=CONFIDENCE.NORM(0.05, STDEV(A2:A6), 5)⁰·⁵`

These formulas calculate the sample mean, sample standard deviation, and 95% confidence interval for the sample mean, using the values generated by the simulation in column A.

c. It may not be reasonable to assume that damage amounts are normally distributed, since they may have a lower bound at zero and a skewed distribution with a longer tail on the positive side. In addition, the standard deviation of the damage amounts may depend on the severity of the accident and other factors that are not accounted for in the simulation. Instead, we might suggest using a distribution that is bounded on the lower end, such as a truncated normal distribution or a gamma distribution. We might also consider incorporating additional factors into the simulation, such as the type of accident, the location of the accident, and the driver's history, to better model the variability in the damage amounts.

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Taking into account the definition of probability, the value of P(A∪B) is 0.686.

Probability  is the possibility that a phenomenon or an event will happen, given certain circumstances. It is expressed as a percentage.

The union of events, AUB and reas as "A or B", is the event formed by all the elements of A and B. That is, the event AUB is verified when one of the two, A or B, or both occurs.

The probability of the union of two compatible events is calculated as the sum of their probabilities subtracting the probability of their intersection:

P(A∪B)= P(A) + P(B) -P(A∩B)

where the intersection of events, A∩B, is the event formed by all the elements that are, at the same time, from A and B. That is, the event A ∩ B is verified when A and B occur simultaneously.

You know:

In this case, considering the definition of union of eventes, you get:

P(A∪B)= 0.4 + 0.66 -0.374

Solving:

P(A∪B)= 0.686

Finally, P(A∪B) has a value of 0.686

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The fraction that is closest to the probability of the next customer paying with cash is 32/100 or 16/50.

To calculate the probability of the next customer paying with cash, we need to determine the total number of customers and the number of customers who paid with cash in the last week. Based on the information given, we know that 76 customers paid with cash in the last week, 44 paid with a debit card, and 116 paid with a credit card. Therefore, the total number of customers in the last week is:

Total number of customers = Number of customers who paid with cash + Number of customers who paid with a debit card + Number of customers who paid with a credit card

Total number of customers = 76 + 44 + 116

Total number of customers = 236

Therefore, the probability of the next customer paying with cash is:

Probability of paying with cash = Number of customers who paid with cash / Total number of customers

Probability of paying with cash = 76 / 236

Probability of paying with cash = 0.32203389831

This means that there is approximately a 32% or 32/100 or 16/50 chance that the next customer will pay with cash.

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Hourly rate for Martin = Total cost of Martin's swimming lessons / Number of hours

Hourly rate for Martin = $80 / 5 hours

What is arithmetic sequence?

An arithmetic sequence is a sequence of numbers in which each term after the first is found by adding a fixed constant number, called the common difference, to the preceding term.

To compare the cost-effectiveness of Danny's and Martin's swimming lessons, we need to calculate their hourly rates.

Danny's hourly rate can be found by dividing the total cost of his swimming lessons by the number of hours:

Hourly rate for Danny = Total cost of Danny's swimming lessons / Number of hours

Hourly rate for Danny = $60 / 4 hours

Hourly rate for Danny = $15/hour

Martin's hourly rate can be found by dividing the total cost of his swimming lessons by the number of hours:

Hourly rate for Martin = Total cost of Martin's swimming lessons / Number of hours

Hourly rate for Martin = $80 / 5 hours.

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The x-bar chart relies on the Normal Distribution due to the Central Limit Theorem, which states that the distribution of sample means will approach a normal distribution as the number of samples increases.


1. An x-bar chart is a type of control chart used to monitor the process mean of a continuous data set. It helps to determine whether a process is stable and under control.

2. The x-bar chart is based on the concept of sampling. In a process, multiple samples are taken, and their means (x-bar) are calculated.

3. According to the Central Limit Theorem, when a large number of samples are taken from a population, the distribution of the sample means will approach a normal distribution, regardless of the population's original distribution.

4. This is why the underlying statistical distribution for the x-bar chart is the Normal Distribution. The x-bar chart assumes that the sample means follow a normal distribution, allowing for the identification of process changes, shifts, or trends by monitoring the control limits and variation in the x-bar chart.

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The height of the triangular pyramid, given that the volume is 318 square centimeters 7.31 cm (option B)

First, we shall obtain the base area of the triangular pyramid. Details below:

A = ½bh

A = ½ × 29 × 9

A = 130.5 cm²

Finally, we shall determine the height of the triangular pyramid. Details below:

V = ⅓Ah

318 = ⅓ × 130.5 × h

318 = 43.5 × h

Divide both sides by 43.5

h = 318 / 43.5

h = 7.31 cm

Thus, the height of the triangular pyramid is 7.31 cm (option B)

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Complete question:

See attached photo

The 95% confidence interval for the difference in population proportions of students who were consuming protein-rich food in 2000 and 2010 is (-0.111, -0.029).

What is confidence interval?

In statistics a confidence interval, usually refers to the probability that a population parameter may fall between a set of values for a certain proportion of times. The often use confidence intervals that contain either 95% or 99% of expected observations.

For constructing a 95% confidence interval for the difference in population proportions of students who were consuming protein-rich food in 2000 and 2010, can be determined by using the formula:

[tex]( p_{1} -p_{2} ) + z^{*} \sqrt{\frac{p_{1}(1-p_{1} ) }{n_{1} } +\frac{p_{2}(1-p_{2}) }{n_{2} }[/tex]

and [tex]( p_{1} -p_{2} ) - z^{*} \sqrt{\frac{p_{1}(1-p_{1} ) }{n_{1} } +\frac{p_{2}(1-p_{2}) }{n_{2} }[/tex]

where:

p₁ and p₂ implies that the sample proportions of students consuming protein-rich food in 2000 and 2010, respectively.

n₁ and n₂ = the sample sizes of the two years.

[tex]z^{*}[/tex] is the critical value of the standard normal distribution corresponding to a 95% confidence level, which is  equals to 1.96.

Using the given data, we have:

p₁ = 0.75, n₁ = 700

p₂ = 0.82, n₂ = 850

Substituting these values into two formulae, we get:

[tex]( 0.75 -0.82) + 1.96\sqrt{\frac{0.75(1-0.75 ) }{700 } +\frac{0.82(1-0.82) }{850 }[/tex]

[tex]( 0.75 -0.82) - 1.96\sqrt{\frac{0.75(1-0.75 ) }{700 } +\frac{0.82(1-0.82) }{850 }[/tex]

Solving the above two expressions, we get:

-0.07 ± 0.041

Hence, rounded to three decimal places, the lower bound is -0.111 and the upper bound is -0.029.

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The scale factor used in the dilation of the triangles is 1/2

From the question, we have the following parameters that can be used in our computation:

The scale factor is calculated as

Scale factor  = A'/A

Substitute the known values in the above equation, so, we have the following representation

Scale factor  = (5, 1)'/(10, 2)

Evaluate

Scale factor  = 1/2

Hence, the scale factor is 1/2

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An equation for the relationship between the thickness and number of weeks is y = -0.2x + 3.8.

In Mathematics and Geometry, the slope-intercept form of the equation of a straight line is given by this mathematical expression;

y = mx + c

Where:

Based on the information provided about the graph of this lake, the y-intercept can be modeled and calculated by using this linear equation at data points (7, 2.4):

y = mx + c

2.4 = -0.2(7) + c

2.4 = -1.4 + c

c = 2.4 + 1.4

c = 3.8

Therefore, the required equation is given by;

y = -0.2x + 3.8

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The standard form of the equation of the parabola is 14x - (y - 4.5)² = 112.

Since the directrix is vertical and at x = a, the parabola has the equation:

(y - k)² = 4p(x - h)

where (h, k) is the vertex and p is the distance from the vertex to the focus or directrix. Since the focus is (8, 8), the vertex is halfway between the focus and directrix, so it is at (8, 4.5) (since the directrix is x = 7.5). The distance from the vertex to the focus or directrix is 3.5, so p = 3.5. Substituting these values into the equation, we get:

(y - 4.5)² = 14(x - 8)

Expanding and putting in standard form, we get:

14x - (y - 4.5)² = 112

Therefore, the standard form of the equation of the parabola is 14x - (y - 4.5)² = 112.

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The interest rate is 11.05%.

What is the interest rate?

The amount of interest due each period expressed as a percentage of the amount lent, deposited, or borrowed is known as an interest rate. The total interest on a loaned or borrowed sum is determined by the principal amount, the interest rate, the frequency of compounding, and the period of time the loan, deposit, or borrowing took place.

Here, we have

Given:  an investment of $5,000 to grow to $8,000 in 9 years if interest is compounded continuously.

We have to find the interest rate.

Investment = $5,000

Time(x) = 9 years

n = 12

Annual amount = $8,000

A = P(1+r/n)ⁿˣ

r = n(A/P)⁻ⁿˣ - 1

r = 12(8000/5000)⁻¹⁰⁸ - 1

r = 12(1.6)⁻¹⁰⁸ -1

r = 12(1.0043) - 1

r = 11.05%

Hence, the interest rate is 11.05%.

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