create a scatter plot of these two variables, with age as the x variable and bone density loss as the y variable. what is your conclusion about this linear relationship; and what is the slope of the least squares regression line?a.the correlation coefficient is approx 0.57, with a positive direction; the slope is 0.41.b.moderately strong negative linear relationship; slope of the least squares line is approx negative 0.41.c.a circular linear positive relationship; slope of the least squares line is approx positive 0.41d.none of the above

The polynomial is P(x)= 2/5x(x-4)²(x+4)

What in mathematics is a polynomial?

A polynomial is a mathematical equation that solely uses the operations addition, subtraction, multiplication, and non-negative integer exponentiation of variables. Variables are sometimes known as indeterminates in mathematics. x²- 4x + 7 is an illustration of a polynomial with a single indeterminate x.

If the polynomial has a root of multiplicity 2 at  x=4, the (x−4)² is a factor.

Multiplicity 1 at x=0, then x is a factor.

Multiplicity 1 at x= -4 then (x+4) is a factor.

So P(x) = Ax(x-4)²(x+4)

As it passes through (5,18) so

18 = A.5.(5-4)² . (5+4)

So, A = 18/5 .(1/9)

= 2/5

Therefore, The polynomial is P(x)= 2/5x(x-4)²(x+4)

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The distinction between real variables and nominal variables is based on the type of measurement used to represent the variable.

A variable is a characteristic that can take different values or levels. Real variables are measured on a numerical scale and can take any value within a certain range.

On the other hand, nominal variables are categorical variables that represent non-numerical attributes. They are used to classify data into different groups or categories based on their characteristics. Examples of nominal variables include gender, race, nationality, and occupation. These variables cannot be measured using a numerical scale, but they can be represented using labels or codes.

The distinction between real variables and nominal variables is important because they require different methods of analysis. Real variables can be analyzed using statistical methods such as mean, standard deviation, and correlation, while nominal variables require different methods such as frequency tables and chi-square tests.

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It is not true that if A is an n × n matrix with detA = 2, then detA³ = 6.

det(A³) = det(A × A × A) = det(A) × det(A) × det(A) = (det(A))³ = 2³ = 8

detA³ = 8, not 6.

The determinant of a matrix is a scalar value that encodes various properties of the matrix.

One of the properties is the volume scaling factor that is induced by the matrix transformation.

The determinant has the property that det(kA) = kⁿ × det(A) for any scalar k and n × n matrix A, where n denotes the dimension of the matrix.

Therefore, we have:

det(A³) = det(A × A × A) = det(A) × det(A) × det(A) = (det(A))³ = 2³ = 8

detA³ = 8, not 6.

The determinant of a matrix raised to a power is not simply obtained by raising the determinant to the same power.

The determinant of a matrix raised to a power can be obtained by raising the determinant of the matrix to the power and then multiplying by the scaling factor induced by the matrix transformation.

Specifically, for a matrix A with detA = 2 and an integer k, we have:

[tex]det(A^k) = (det(A))^k \times scaling factor induced by A^k[/tex]

The scaling factor induced by [tex]A^k[/tex] can be computed by considering the effect of [tex]A^k[/tex] on the unit hypercube.

This calculation requires the use of linear algebra and is beyond the scope of this answer.

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The sail would move 3/25 of a mile, or approximately 0.12 miles in one hour.

Let's start by finding the distance traveled by the sail in 1/6 of an hour. We can do this by dividing 5/6 by 5 (the numerator and denominator of 1/6 are obtained by dividing the numerator and denominator of 5/6 by 5).

(5/6) ÷ 5 = 1/6

Now, we know that the sail moves 1/50 of a mile in 1/6 of an hour. To find how far it would move in one hour, we need to multiply 1/50 by the reciprocal of 1/6. The reciprocal of a fraction is obtained by flipping it upside down.

(1/50) × (6/1) = 6/50

Simplifying 6/50, we get 3/25. Therefore, the sail would move 3/25 of a mile in one hour if it continues at the same pace.

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Density curves can occur in a variety of shapes, depending on the distribution of the underlying data.

The normal distribution is the most commonly encountered density curve, other shapes are also possible, including skewed, bimodal, uniform, and multimodal distributions.

A skewed density curve can be either positively skewed, where the tail is longer on the right-hand side, or negatively skewed, where the tail is longer on the left-hand side.

A density curve for income data might be positively skewed, since there are more people with lower incomes than with higher incomes, and the higher incomes have a longer tail to the right.

Another type of density curve is the bimodal distribution, which has two peaks or modes.

This can occur when there are two distinct groups or populations within the data, such as in the case of height data for men and women.

Density curves can also take on other shapes, such as a uniform distribution where all values are equally likely, or a multimodal distribution where there are more than two modes.

Density curves can occur in a variety of shapes depending on the underlying distribution of the data.

The normal distribution is the most commonly encountered density curve, other shapes are also possible, including skewed, bimodal, uniform, and multimodal distributions.

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The amount in the savings account after each number of years are as follows

2 years = $3413.6

5 years = $3434

8 years = $3454.4

In Mathematics, simple interest can be calculated by using this formula:

S.I = PRT or S.I = A - P

Where:

By substituting the given parameters into the simple interest formula, we have;

SI = 3400 × 0.2/100 × 2

SI = $13.6

A = SI + P = 13.6 + 3400 = $3413.6

After 5 years, we have:

SI = 3400 × 0.2/100 × 5

SI = $34

A = SI + P = 34 + 3400 = $3434

After 8 years, we have:

SI = 3400 × 0.2/100 × 8

SI = $54.4

A = SI + P = 54.4 + 3400 = $3454.4

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Complete Question:

Charlyne deposited $3400 into a savings account that has an annual simple interest rate of 0.2%. Find the amount in the savings account after each number of years.

2 years $

5 years $

8 years $

The simplified form of expression [tex]\sqrt[4]{\frac{3}{2x} }[/tex] is  [tex]\frac{\sqrt[4]{24 x^3}}{2x }[/tex]

The correct answer is an option (B)

Consider an expression [tex]\sqrt[4]{\frac{3}{2x} }[/tex]

Multiply the fraction by an expression to form a perfect square in the denominator.

[tex]\sqrt[4]{\frac{3}{2x} }[/tex]

[tex]=\sqrt[4]{\frac{3\times 2^3\times x^3}{2x\times 2^3\times x^3} }[/tex]

We know that the cube of 2 is 8. So, substitute 2³ = 8

[tex]=\sqrt[4]{\frac{3\times 8\times x^3}{2x\times 8\times x^3} }[/tex]

Now, we multiply the monomials.

[tex]=\sqrt[4]{\frac{24\times x^3}{16\times x^4} }[/tex]

We know that the exponent rule [tex](a\times b)^m=a^m\times b^m[/tex]

[tex]=\frac{\sqrt[4]{24\times x^3}}{\sqrt[4]{16\times x^4} }[/tex]

We know that 2⁴ = 16

[tex]=\frac{\sqrt[4]{24\times x^3}}{\sqrt[4]{2^4\times x^4} }\\\\=\frac{\sqrt[4]{24\times x^3}}{\sqrt[4]{2^4}\times \sqrt[4]{x^4} }[/tex]        ............(using the exponent rule [tex](a\times b)^m=a^m\times b^m[/tex])

[tex]=\frac{\sqrt[4]{24\times x^3}}{2x }[/tex]           .......(Simplify the radical expressions)

Here, [tex]\frac{\sqrt[4]{24 x^3}}{2x }[/tex] is the simplified form of expression.

Therefore, the correct answer is an option (B)

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Find the complete question below.

The standard deviation for the random variable X, the number of wins, is approximately 0.10341.

Probability of winning a certain lottery [tex]= 1/51,949[/tex]

560 times were played overall.

Let X represent the random variable that represents the number of victories out of 560 plays.

The probability of winning in one play is [tex]p = 1/51,949[/tex]. The probability of not winning in one play is [tex]q = 1 - p[/tex]

[tex]q = (51,949 - 1) / 51,949[/tex]

[tex]q = 51,948 / 51,949.[/tex]

What X should actually be is:

[tex]E(X) = np[/tex]

[tex]E(X) = 560 * (1/51,949)[/tex]

[tex]E(X) = 0.010793[/tex]

The variance of X is:

[tex]Var(X) = npq[/tex]

[tex]Var(X) = 560 * (1/51,949) * (51,948/51,949)[/tex]

[tex]Var(X) = 0.010699[/tex]

The value of X's standard deviation is

[tex]SD(X) = \sqrt{Var(X)}[/tex]

[tex]SD(X) = \sqrt{0.010699}[/tex]

[tex]SD(X) = 0.10341[/tex](approx)

Therefore, the standard deviation for the random variable X, the number of wins, is approximately 0.10341.

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Julie's z-score is 1.5. This means that her score on the final was 1.5 standard deviations above the mean score of the class.

What is the mean and standard deviation?

The standard deviation is a summary measure of the differences of each observation from the mean. If the differences themselves were added up, the positive would exactly balance the negative and so their sum would be zero. Consequently, the squares of the differences are added.

To calculate Julie's z-score, we need to use the formula:

z = (x - μ) / σ

where:

x is Julie's score on the final (84)

μ is the mean score of the class (75)

σ is the standard deviation of the class (6)

Plugging in the values, we get:

z = (84 - 75) / 6

z = 1.5

Therefore, Julie's z-score is 1.5. This means that her score on the final was 1.5 standard deviations above the mean score of the class.

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Therefore, the required probabilities are:

a) P(red car) = 0.537

b) P(speeding ticket) = 0.546

c) P(speeding ticket | red car) = 0.421

d) P(red car | speeding ticket) = 0.413

e) P(red car and speeding ticket) = 0.226

f) P(red car or speeding ticket) = 0.857

a) The probability that a randomly chosen person has a red car is the number of people with red cars divided by the total number of people, which is:

P(red car) = 335/624

= 0.537 (rounded to the nearest thousandth).

b) The probability that a randomly chosen person has a speeding ticket is the number of people with speeding tickets divided by the total number of people, which is:

P(speeding ticket) = 341/624

= 0.546 (rounded to the nearest thousandth).

c) The probability that a randomly chosen person has a speeding ticket given they have a red car is the number of people with red cars and speeding tickets divided by the number of people with red cars, which is:

P(speeding ticket | red car) = 141/335

= 0.421 (rounded to the nearest thousandth).

d) The probability that a randomly chosen person has a red car given they have a speeding ticket is the number of people with red cars and speeding tickets divided by the number of people with speeding tickets, which is:

P(red car | speeding ticket) = 141/341

= 0.413 (rounded to the nearest thousandth).

e) The probability that a randomly chosen person has a red car and got a speeding ticket is the number of people with red cars and speeding tickets divided by the total number of people, which is:

P(red car and speeding ticket) = 141/624

= 0.226 (rounded to the nearest thousandth).

f) The probability that a randomly chosen person has a red car or got a speeding ticket is the sum of the probabilities of having a red car and having a speeding ticket minus the probability of having both, which is:

P(red car or speeding ticket) = P(red car) + P(speeding ticket) - P(red car and speeding ticket)

= 0.537 + 0.546 - 0.226

= 0.857 (rounded to the nearest thousandth).

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The possible values of the sum of a, b and c is (c) - 14

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

Vertex = (9, -14)

It intersects the x-axis at two points.

So, we have (x₁, 0) and (x₂, 0)

The equation of a parabola in vertex form is represented as

y = a(x - h)² + k

Where

Vertex = (h, k)

So, we have

y = a(x - 9)² - 14

Expanding the equation, we have

y = a(x² - 18x + 81) - 14

Open the brackets

This gives

y = ax² - 18ax + 81a - 14

Set a = 0

So, we have

y = (0)x² - 18(0)x + 81(0) - 14

Evaluate

y = 0x² - 0x - 14

This means that

a = 0

b = 0

c = -14

Add the constants a, b and c

So, we have

Sum of constant = 0 + 0 - 14

Evaluate the sum

Sum of constant = - 14

Hence, the possible value of a + b + c is -14

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The probability that at least one of the two adults smokes is approximately 0.4375, or 0.438 rounded to 4 decimal places.

What is probability?

Probability is a measure of the likelihood of an event occurring. It is a number between 0 and 1, where 0 means the event is impossible and 1 means the event is certain to happen.

To find the probability that at least one of the two adults smokes, we can calculate the probability that neither of them smokes and then subtract that from 1.

Let's assume that the probability that an adult smokes is p. Then, the probability that an adult does not smoke is (1-p). Since the two adults are selected randomly, the probability that both of them do not smoke is (1-p)*(1-p), or (1-p)².

Therefore, the probability that at least one of the two adults smokes is:

1 - (1-p)²

Simplifying this expression, we get:

1 - (1 - 2p + p²)

= 2p - p²

We don't know the value of p, but we can assume a reasonable value based on smoking rates in the population. Let's say that p is 0.25, or 25%.

Substituting this value into the equation, we get:

2(0.25) - (0.25)²

= 0.5 - 0.0625

= 0.4375

Therefore, the probability that at least one of the two adults smokes is approximately 0.4375, or 0.438 rounded to 4 decimal places.

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Slope of the normal L is 21/8.

Hence the correct option is (A).

Slope of normal to a function f(x) = y is given by = -dx/dy

Given the equation of the curve is,

2xy² - 3y = 18

Differentiating the function with respect to 'x' we get,

2x*2y*dy/dx + 2y²*1 - 3 dy/dx = 0

4xy*dy/dx + 2y² - 3dy/dx = 0

(3 - 4xy)dy/dx = 2y²

dy/dx = 2y²/(3 - 4xy)

-dx/dy = (4xy - 3)/2y²

Slope of the normal L at the point (3, 2) = (4*3*2 - 3)/(2*2²) = (24 - 3)/8 = 21/8

Hence the correct option is (A).

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Answer:

Yes, the function is exponential.

Step-by-step explanation:

The "^" represents an exponet. If you want to know, the exponent is 3.

The arithmetic sequence is given by the expression A = 5 + 4n

Given data ,

Let the number sequence be represented as A

Now , the value of A is

A = 5 + 9 + 13 + 17 + 21 ...

On simplifying , we get

The first term of the series is a₁ = 5

Let the second term be a₂ = 9

So , the common difference d = a₂ - a₁

d = 9 - 5 = 4

And , let the number of terms be n

So , the expression is

A = 5 + 4n

when n = 4

A = 5 + 4 ( 4 ) = 25

Hence , the arithmetic sequence is A = 5 + 4n

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The independent variable in this scenario is the number of guests that will be attending the cookout. The number of hot dogs needed is dependent on the number of guests, as the coach plans to provide two hot dogs for each guest and an additional 8 hot dogs for potential extra guests.

. In this situation, the coach needs to determine the number of hot dogs required for the cookout based on the number of guests. Let's represent the number of guests as "g" (independent variable) and the total number of hot dogs needed as "h" (dependent variable).

The coach wants 2 hot dogs for each guest and 8 extra hot dogs. So, the equation would be:

h = 2g + 8

In this equation, the independent variable is "g" (number of guests) because the total number of hot dogs needed (dependent variable "h") depends on how many guests are attending the cookout.

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Gaining a full grasp of the regulations relating to integers requires insight and precision. To get started, here's an overview of some essential tips:

Comprehending Integers: Essentially, integers are entire numbers (whether negative, positive or zero) that don't encompass any fractions or decimals.

Familiarizing Yourself with Basic Operations: The four primary operations when it comes to maniputating integers include subtraction, addition, multiplication, and division.

Absorbing Diverse Guidelines: There are individual protocols for each operation, such as rules for adding and subtracting integers having disparate signs, as well as guidance for multiplying and dividing integers boasting diverse signs.

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In a case whereby there is a spinner with three equal sections colored red, white, and blue the  P(yellow) is 33%

Probability can be described as trhe act of showing how likely something is to happen it should be noted that this usually comes into play when we were not sure about the outcome of an event,  and the analysis of events governed by probability can be regarded as statistics.

P(yellow) =  1/3

= 0.33

0.33 * 100

= 33 percent

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The volume of solid generated by rotating the region bounded by curves y = ln( 3x), y = 2, y = 3, x= 0; about the y-axis is equals to the [tex] \frac{π}{18}({e^6}- e^4)[/tex]. The volume of solid generated by rotating the region bounded by curves = 9x⁶, y = 9x, x ≥0; about x-axis is equals to the [tex]\frac{81π}{13} \\ [/tex].

We have a solid obtained by rotating the region bounded by the curves with equations, y = ln 3x, y = 2, y = 3, x= 0; about the specified line, y-axis. We have to determine the volume, V of that solid. First, see the above diagram where red line, green line, blue line and purple lines represent y = ln 3x, y = 3, y = 2, x= 0 respectively. The volume of shaded region will be determine. Using formula, [tex]V = \int_{y = 2}^{y = 3} πx² dy \\ [/tex]

Now, y = ln( 3x)

taking exponential both sides,

[tex]e^ y = 3x [/tex]

[tex]x = \frac{ e^y}{3}[/tex]

so, [tex]V = \int_{y = 2}^{y = 3} π ( \frac{e^y}{3})² dy \\ [/tex]

[tex]= \int_{y = 2}^{y = 3} π ( \frac{e^{2y}}{9})dy \\ [/tex]

[tex]=[π(\frac{e^{2y}}{9 \times 2})]_{2}^{3} [/tex]

[tex]= π ( \frac{e^6}{18} -\frac{ e^4}{18})[/tex]

[tex]= \frac{π}{18}({e^6}- e^4)[/tex]

Hence, required value is [tex]= \frac{π}{18}({e^6}- e^4)[/tex].

Solid obtained by rotating the region bounded by the curves with equations, y = 9x⁶, y = 9x, x ≥0; about the specified line, x-axis. We have to determine the volume, V of that solid. First we determine the intersection points of y = 9x² and y = 9x

=> 9x = 9x²

=> x = 1

Using the formula, [tex]V = \int_{x= 0}^{x = 1} πy² dx \\ [/tex]

[tex] = \int_{x= 0}^{x = 1} π(9x⁶)² dx \\ [/tex]

[tex] = \int_{x= 0}^{x = 1} 81πx¹² dx \\ [/tex]

[tex] = 81π [ \frac{x¹³}{13}]_{x= 0}^{x = 1} \\ [/tex]

[tex] = 81π [ \frac{1¹³}{13} - 0] \\ [/tex]

[tex] = \frac{81π}{13} \\ [/tex]. Hence, required value is [tex]\frac{81π}{13} \\ [/tex].

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Answer:

5

Step-by-step explanation:

Given a=12 and c=13,

b = 5

∠α = 67.38° = 67°22'48" = 1.17601 rad

∠β = 22.62° = 22°37'12" = 0.39479 rad

h = 4.61538

area = 30

perimeter = 30

inradius = 2

circumradius = 6.5

To subtract 1/2h-1 from 3/4h+4, we can distribute the negative sign to the expression 1/2h-1 and then combine like terms. This gives:

(3/4h + 4) - (1/2h - 1)

= 3/4h + 4 - 1/2h + 1 (distributing the negative sign)

= (3/4h - 1/2h) + (4 + 1) (combining like terms)

= 1/4h + 5

Therefore, the result of subtracting 1/2h-1 from 3/4h+4 is 1/4h+5.

The probability of P(3 < X ≤ 6) is approximately 0.6575.

The study of probabilities, which are determined by the ratio of favourable occurrences to probable cases, is known as probability.

To find P(3 < X ≤ 6), where X represents the number of times heads is tossed when a fair coin is tossed 10 times, we need to calculate the probability of obtaining more than 3 but less than or equal to 6 heads.

Since the coin is fair, the probability of getting heads on any single toss is 0.5, and the probability of getting tails is also 0.5.

We can use the binomial probability formula to calculate the probability for a specific number of heads in a given number of coin tosses:

P(X = k) = (n choose k) * [tex]p^k[/tex] *[tex](1-p)^{(n-k)[/tex],

where n is the number of trials, k is the number of successful outcomes, p is the probability of success on each trial, and (n choose k) is the binomial coefficient.

In this case, n = 10 (10 coin tosses), p = 0.5 (probability of heads), and we want to calculate the probability for 4, 5, and 6 heads.

P(3 < X ≤ 6) = P(X = 4) + P(X = 5) + P(X = 6)

Using the binomial probability formula, we can calculate these probabilities:

P(X = 4) = (10 choose 4) * [tex](0.5^4) * (0.5^6)[/tex] = 210 * 0.0625 * 0.015625 = 0.2063

P(X = 5) = (10 choose 5) * [tex](0.5^5) * (0.5^5)[/tex] = 252 * 0.03125 * 0.03125 = 0.2461

P(X = 6) = (10 choose 6) * [tex](0.5^6) * (0.5^4)[/tex] = 210 * 0.015625 * 0.0625 = 0.2051

Finally, we can calculate the desired probability:

P(3 < X ≤ 6) = P(X = 4) + P(X = 5) + P(X = 6) = 0.2063 + 0.2461 + 0.2051 = 0.6575

Therefore, P(3 < X ≤ 6) is approximately 0.6575.

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The simplified rational expression for this problem is given as follows:

[tex]\frac{3\sqrt{21} + 13}{12}[/tex]

The rational expression in the context of this problem is defined as follows:

[tex]\frac{\sqrt{7} + \sqrt{3}}{2\sqrt{3} - \sqrt{7}}[/tex]

The first step in simplifying the expression is removing the root from the denominator, multiplying numerator and denominator by the conjugate, as follows:

[tex]\frac{\sqrt{7} + \sqrt{3}}{2\sqrt{3} - \sqrt{7}} \times \frac{2\sqrt{3} + \sqrt{7}}{2\sqrt{3} + \sqrt{7}}[/tex]

Applying the subtraction of perfect squares, the denominator is given as follows:

2² x 3 - 7 = 12.

The numerator is:

[tex](\sqrt{7} + \sqrt{3})(2\sqrt{3} + \sqrt{7}) = 2\sqrt{21} + 7 + 6 + \sqrt{21} = 3\sqrt{21} + 13[/tex]

Thus the simplified expression is:

[tex]\frac{3\sqrt{21} + 13}{12}[/tex]

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For a large sample of blood pressure values with a mean of 120 and a standard deviation of 10, the interval that is likely to cover about 95% of the blood pressures in the sample is between 100 and 140.

Based on the given information, we can use the empirical rule to estimate the interval that is likely to cover about 95% of the blood pressures in the sample. The empirical rule states that for a bell-shaped curve, approximately 68% of the data falls within one standard deviation of the mean, about 95% falls within two standard deviations of the mean, and nearly all (99.7%) falls within three standard deviations of the mean.

Therefore, for a large sample of blood pressure values with a mean of 120 and a standard deviation of 10, the interval that is likely to cover about 95% of the blood pressures in the sample is between 100 and 140. This is because two standard deviations above and below the mean (2 x 10 = 20) added to and subtracted from the mean (120) gives us a range of 100 to 140.

Based on the given information, for a large sample of blood pressure values with a mean of 120 and a standard deviation of 10, and assuming a bell-shaped curve, the interval likely to cover about 95% of blood pressures in the sample would be within two standard deviations from the mean. This interval can be calculated as follows:

Lower limit: Mean - (2 × Standard Deviation) = 120 - (2 × 10) = 100
Upper limit: Mean + (2 × Standard Deviation) = 120 + (2 × 10) = 140

So, the interval that covers approximately 95% of blood pressures in the sample is 100 to 140.

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To determine if the criteria for approximate normality is met, we need to check if both the sample size and sample proportion are large enough. The sample size is n = 11,954 which is greater than 10.

Additionally, the sample proportion of landing on its right side is p = 0.571 which is also greater than 10. Therefore, the criteria for approximate normality is met.

A 99% confidence interval would be wider than the 90% confidence interval. This is because a higher confidence level requires a larger range to ensure the true population proportion is captured within the interval with a higher degree of certainty.

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The expressions are equivalent to the given expression are x + x + 6 – 7 + x and 3 – x + 2x – 4 + 2x. Therefore, the options A and C are correct answer.

The given expression is 6+(-x)+2x+(-7)+2x.

If two algebraic expressions are equivalent, then the two expressions have the same value when we plug in the same value for the variable.

Here, group the like terms, we get

(-x+2x+2x)+(6-7)

= 3x-1

Therefore, the options A and C are correct answer.

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Answer:

yo

Step-by-step explanation:

the answers are A and C

x + x + 6 – 7 + x and  3 – x + 2x – 4 + 2x

Edge 2023

Answer:480cm^3

Step-by-step explanation:

Answer:

(i) To simplify (b²-a²) ÷ (2a²+ab-3b²), we can factor the numerator and denominator using the difference of squares formula, which states that a² - b² = (a + b)(a - b).

(b²-a²) = (b + a)(b - a)

(2a²+ab-3b²) = (2a-b)(a+3b)

Thus, we can rewrite the expression as:

(b + a)(b - a) / (2a-b)(a+3b)

(ii) To simplify (3x-3y) ÷ (ax-ay-x+y), we can factor out the common factor of 3 from the numerator and the common factor of (a-1) from the denominator:

3(x-y) / (a-1)(x-y)

We can then cancel the common factor of (x-y) to get the simplified form:

3 / a-1

(iii) To simplify (y²-6y-7) ÷ (2y²-17y+21), we can factor both the numerator and the denominator:

(y-7)(y+1) / (2y-3)(y-7)

We can then cancel out the common factor of (y-7) to get the simplified form:

(y+1) / (2y-3)

(iv) To simplify (a²-ab-ac+bc) ÷ (a²+ab-ac-bc), we can factor out the -1 from the denominator:

(a²-ab-ac+bc) ÷ -1(a²-ab+ac-bc)

We can then factor out the common factor of (a-b) from both the numerator and the denominator:

(a-b)(a-c) ÷ -1(a-b)(a+c)

Cancelling out the common factor of (a-b) gives us the simplified expression:

(c-a) / (a+c)

If one dimension was quadrupled, second dimension was halved and third dimension did not change, the volume of a cube would be changed by 27 cubic centimeters to 54 cubic centimeters.

First we identify the original dimensions of the cube. It is given that volume of the cube is 27 cubic centimeters, each side of the cube will be 3 centimeters (3x3x3=27).

According to the question:

One dimension was quadrupled: 3 x 4 = 12cm

Second dimension was halved: 3 / 2 = 1.5cm

Third dimension did not change: 3cm

So, new dimensions are 12cm x 1.5cm x 3 cm

To find the new volume, we will use the formula:

V = product of dimensions

12 cm x 1.5 cm x 3 cm = 54 cubic centimeters

Therefore, the new volume of the cube would be 54 cubic centimeters.

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After performing the calculations, you'll find that the probability of less than 3 households having board games out of 10 households is approximately 0.0038 or 0.38%.

To find the probability that less than 3 households have board games, we can use the binomial probability formula. The terms involved in this problem are:

1. n: number of trials (households)
2. k: number of successful outcomes (households with board games)
3. p: probability of success (having board games)
4. q: probability of failure (not having board games)

Given that 75% of households have board games, p = 0.75, and q = 1 - p = 0.25. In this case, n = 10 households. We need to find the probability of k = 0, 1, or 2 households having board games.

The binomial probability formula is:
P(X = k) = C(n, k) * p^k * q^(n-k)

Step 1: Calculate the probability for k = 0, 1, and 2 separately:
P(X = 0) = C(10, 0) * 0.75^0 * 0.25^10
P(X = 1) = C(10, 1) * 0.75^1 * 0.25^9
P(X = 2) = C(10, 2) * 0.75^2 * 0.25^8

Step 2: Add the probabilities for k = 0, 1, and 2 to get the total probability:
P(X < 3) = P(X = 0) + P(X = 1) + P(X = 2)

After performing the calculations, you'll find that the probability of less than 3 households having board games out of 10 households is approximately 0.0038 or 0.38%.

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