The weight of persons of a certain age is normally distributed with a mean of 160 pounds and a standard deviation of 15 pounds. What range of weights should the middle 68% contain? I If X is normally

Answer:

x=4, -7

Step-by-step explanation:

4 (x−4)(x+7)=0

If any individual factor on the left side of the equation is equal to 0, the entire expression will be equal to 0.

x−4=0x+7=0Set x−4 equal to 0 and solve for x. Set

x+7 equal to 0.x+7=0

Subtract 7 from both sides of the equation. x=−7

The final solution is all the values that make 4(x−4)(x+7)=0 true.

x=4,−7

Answer: 401.92

Step-by-step explanation:

V=πr^2h

=π(4^2)(8)

=π(16)(8)

=π128

=401.92

Hope this helps! :)

Lily would need 40.64 centimeters of copper wire for her experiment.

Given data ,

We may use the conversion factor that 1 inch is equivalent to 2.54 centimeters to convert 16 inches to centimeters .

From the unit conversion ,

1 inch = 2.54 inches

Consequently, 16 inches is equivalent to :

40.64 centimeters are equal to 16 inches at 2.54 centimeters per inch.

Hence , Lily would thus want 40.64 centimeters of copper wire for her experiment.

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The value of x in the equation 2x² + 10x + 12 = 0 is -2 and -3.

An equation is an expression that can be used to show the relationship between two or more numbers and variables using mathematical operators.

The standard form of a quadratic equation is:

ax² + bx + c = 0

The quadratic formula is given by:

[tex]x=\frac{-b\pm\sqrt{b^2-4ac} }{2a} \\\\Given\ the\ equation\ 2x^2+10x+12=0:\\\\a=2;b=10;c=12\\\\x=\frac{-b\pm\sqrt{b^2-4ac} }{2a} \\\\substituting:\\\\x=\frac{-10\pm\sqrt{10^2-4(2)(12)} }{2(2)} \\\\x=-3; and\ x=-2\\[/tex]

The value of x is -2 and -3.

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The presence of extreme values can cause the standard deviation to be larger than it would be otherwise, indicating greater variability in the data set.

The mean is the measure of central tendency that is most affected by extreme values or outliers. The mean is calculated by adding up all the data points and dividing by the total number of data points. Since extreme values can be significantly different from the other values in the data set, their effect on the mean can be significant.

For example, consider the following data set of salaries for a company: $30,000, $35,000, $40,000, $45,000, $50,000, and $1,000,000. The mean salary for this data set is calculated as:

($30,000 + $35,000 + $40,000 + $45,000 + $50,000 + $1,000,000) ÷ 6 = $193,333.33

Here, the extreme value of $1,000,000 has significantly impacted the mean salary. Even though the other salaries are all within a reasonable range, the mean is skewed by the extreme value.

On the other hand, the median and mode are less affected by extreme values. The median is the middle value in a data set when the data is arranged in order, and the mode is the most frequently occurring value. In the above example, the median salary would be $42,500, and the mode would be undefined as no salary occurs more than once.

The standard deviation is a measure of the spread or dispersion of the data, and is not directly affected by extreme values. However, the presence of extreme values can cause the standard deviation to be larger than it would be otherwise, indicating greater variability in the data set.

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Answer: 8 2/5 feet (positive)

Step-by-step explanation:

For all vectors v in the vector space V, the expression 0 - v is equal to the additive inverse of v, or -v.

To prove that for all vectors v in a vector space V, and with 0 as the zero vector, the expression 0 - v is equal to the additive inverse of v.

To prove this, we'll follow these steps,

1. Start with the definition of the zero vector in a vector space V.
2. Show that adding the additive inverse of v to both sides of the equation results in the desired expression.

1. Let V be a vector space and 0 be the zero vector. By definition, the zero vector has the property that for all vectors v in V, we have:
  v + 0 = v

2. To find the expression for 0 - v, we first need to determine the additive inverse of v, denoted by -v. The additive inverse of v has the property:
  v + (-v) = 0

Now, let's consider the expression 0 - v. To find this, we can rewrite it as 0 + (-v). Using the property of the zero vector, we know that:

0 - v = 0 + (-v) = -v

Hence, for all vectors v in the vector space V, the expression 0 - v is equal to the additive inverse of v, or -v.

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The width of the walkway is 3.27 feet.

We have,

Let's assume that the width of the walkway is y feet.

Dimensions of the pool and the walkway can be represented as follows:

Length = 2(x+y) + 13

Width = 2(x+y) + 10

The area of the pool and the walkway.

Area = Length x Width

Area = (2(x+y) + 13) x (2(x+y) + 10)

We know that the total area of the pool and the walkway is 304 square feet.

So,

(2(x+y) + 13) x (2(x+y) + 10) = 304

Expanding the left-hand side and simplifying, we get:

4x² + 28x + 39y + 65 = 304

Rearranging and simplifying, we get:

4x² + 28x + 39y - 239 = 0

We can use the quadratic formula to find the solution:

y = (-b ± √(b² - 4ac)) / 2a

where a = 4, b = 39, and c = -239.

Substituting these values, we get:

y = (-39 ± √(39² - 44(-239))) / 8

Simplifying, we get:

y ≈ 3.27 or y ≈ -18.27 (rejected)

Therefore,

The width of the walkway is 3.27 feet.

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The value of the given expression is -4, which is integer. Therefore, option B is the correct answer.

The given expression is (p²+q)/(-|p|-q).

Here, p=-6 and q=4.

Substitute p=-6 and q=4 in the given expression we get

((-6)²+4)/(-|-6|-4)

= 40/(-10)

= -4

Therefore, option B is the correct answer.

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If Mexico, one of our largest trading partners, goes into a recession, it is likely to decrease its demand for our exports. This would shift the aggregate demand (AD) curve leftward, leading to a decrease in equilibrium GDP and price level in the short run.

In the AD/AS model, a decrease in aggregate demand would cause a leftward shift of the AD curve. As a result, the intersection point of the AD and the short-run aggregate supply (SRAS) curves would move to the left, causing a decrease in equilibrium GDP and price level.

In the long run, however, the economy is likely to adjust to the new equilibrium. The decrease in aggregate demand would cause a decrease in prices, which would shift the SRAS curve rightward. Eventually, the new intersection point of the AD and the SRAS curves would be reached, resulting in a new equilibrium GDP and price level.

Overall, a recession in Mexico would likely have a negative impact on the US economy, leading to a decrease in GDP and price level in the short run. However, the economy would eventually adjust to the new equilibrium in the long run.

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The new angle at which the tree is leaning is approximately 47.56 degrees.

To calculate the new angle of the tree after it leans back, we can use the concept of similar triangles. Initially, you have a shadow of 8 feet while being 5.5 feet tall. The tree's shadow is 48 feet long. Let's denote the height of the tree as H.

Using the initial measurements, we can set up the proportion:

5.5 / 8 = H / 48

Solving for H, we get:

H = (5.5 / 8) * 48 = 33 feet

Now, the tree leans back, and its shadow is now 30 feet long. We can use the tangent function to find the angle at which the tree is leaning:

tan(angle) = opposite / adjacent
tan(angle) = 33 / 30

To find the angle, we can take the inverse tangent:

angle = arctan(33 / 30)

angle ≈ 47.56 degrees

So, the new angle at which the tree is leaning is approximately 47.56 degrees.

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All real values of a such that the given matrix is not invertible is -3.

To determine if a matrix is invertible, we can look at its determinant. A matrix is invertible if and only if its determinant is non-zero. Therefore, we need to find the values of a that make the determinant of matrix A equal to zero.

The determinant of matrix A is given by:

|A| = 0 1 a a 1 3 0 a 1 a

= 0(a(1)(1) - a(3)(1) + 1(0)) - 1(1(a)(1) - a(3)(0) + 1(0)) + a(1(3) - 1(0) + 0(a))

= -a + 3a + 3 - a

= a + 3

Therefore, the matrix A is not invertible when a = -3.

So the real value of a for which the matrix A is not invertible is -3.

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The null hypothesis and conclude that the mean mercury content of Albacore tuna is greater than 0.126 ppm.

(a) The appropriate method to compute a p-value for a test of whether the mean mercury content of Albacore tuna is greater than 0.126 ppm is a t-test because the sample size is less than 30 and the standard deviation of the population is unknown.

(b) The null hypothesis for this study is that the mean mercury content of Albacore tuna is equal to 0.126 ppm, and the alternative hypothesis is that the mean mercury content is greater than 0.126 ppm.

To find the theory-based p-value, we can use the t-distribution with 42 degrees of freedom (43-1). The test statistic is:

t = (x - μ) / (s / sqrt(n))

where x is the sample mean (0.358 ppm), μ is the hypothesized population mean (0.126 ppm), s is the sample standard deviation (0.138 ppm), and n is the sample size (43).

Substituting the values, we get:

t = (0.358 - 0.126) / (0.138 / sqrt(43)) = 10.29

Using a t-table or calculator, the p-value for a one-tailed test with 42 degrees of freedom and a test statistic of 10.29 is less than 0.001. Therefore, we can conclude that there is strong evidence to reject the null hypothesis and conclude that the mean mercury content of Albacore tuna is greater than 0.126 ppm.

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Is because the standard error is the standard deviation of the sampling distribution of the difference between the means, and as such, the differences between the sample means would vary across multiple random samples of the same size.

For part b, the standard error for the difference between the sample means can be calculated as:

[tex]se = sqrt((s1^2/n1) + (s2^2/n2))[/tex]

where s1 and s2 are the sample standard deviations for the two groups, and n1 and n2 are the sample sizes.

Substituting the given values, we get:

[tex]se = sqrt((8.43^2/21) + (3.5^2/21)) ≈ 2.15[/tex]

Interpretation: The standard error represents the standard deviation of the sampling distribution of the difference between the sample means. A lower standard error indicates that the sample means are more likely to be representative of their respective populations, and that the difference between the means is more likely to be significant.

The correct answer is (A): If further random samples of these sizes were obtained from these populations, the differences between the sample means would vary. The standard deviation of these values for (x1-x2) would equal about 2.2. This is because the standard error is the standard deviation of the sampling distribution of the difference between the means, and as such, the differences between the sample means would vary across multiple random samples of the same size.

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The acceleration of the box is 0.4 m/s².

The magnitude of the force that Rory applies is 20.12 N.

(a)

The acceleration of the box can be calculated using the formula:

[tex]a = (v_f^2 - v_i^2) / (2d)[/tex]

where vf is the final velocity, vi is the initial velocity, and d is the distance traveled.

Substituting the given values, we get:

a = (1.2² - 0²) / (2 x 1.8)

a = 0.4 m/s²

(b)

To find the magnitude of the force that Rory applies, we can use Newton's second law, which states that the net force on an object is equal to its mass times its acceleration:

F(net) = ma

The resistance force is acting in the opposite direction to the force applied by Rory.

F(applied) - F(resistance) = ma

Substituting the given values.

F(applied) - 19 = 2.8 x 0.4

F(applied) = 19 + 1.12 = 20.12 N

Therefore, the magnitude of the force that Rory applies is 20.12 N.

Thus,

The acceleration of the box is 0.4 m/s².

The magnitude of the force that Rory applies is 20.12 N.

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To determine if the events "a selected student is underweight" (A) and "a selected student is male" (M) are independent, we need to check if the probability of both events occurring together is equal to the product of the probabilities of each event occurring individually.

Step 1: Calculate the probabilities of each event individually.
P(A) = P(Underweight) = (43 + 24) / 300 = 67 / 300
P(M) = P(Male) = (43 + 17) / 300 = 60 / 300

Step 2: Calculate the probability of both events occurring together.
P(A ∩ M) = P(Underweight and Male) = 43 / 300

Step 3: Check if P(A ∩ M) = P(A) * P(M)
(67 / 300) * (60 / 300) ≠ 43 / 300

Since the probabilities are not equal, the events "a selected student is underweight" and "a selected student is male" are not independent.

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The value of z is given as follows:

z = 38.

We have two secants in this problem, and point C is the intersection of the two secants, hence the angle measure of z is half the difference between the angle measure of the largest arc by the angle measure of the smallest arc.

The arc measures are given as follows:

138º and 62º.

Hence the value of z is obtained as follows:

z = 0.5 x (138 - 62)

z = 38.

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The forecast for Y3 is -3/8.

We can start by writing the MA(1) process as:

Yt = μ + θεt-1 + εt

where μ is the process mean, θ is the MA(1) coefficient, εt is the white noise error term with mean zero and variance σ^2.

From the given information, we know that the process mean is zero, so μ = 0.

The conditional least-squares estimate of θ given the first two observations can be obtained by minimizing the sum of squared errors:

S(θ) = (y1 - θε0)^2 + (y2 - μ - θε1)^2

where ε0 and ε1 are unobserved error terms and y1, y2 are the first two observations.

Substituting the given values, we get:

S(θ) = 1 + θ^2 + (1/4 - θ)^2

Taking the derivative of S(θ) with respect to θ and setting it to zero, we get:

dS(θ)/dθ = 2θ - 2(1/4 - θ) = 0

Solving for θ, we get:

θ = 3/8

Therefore, the conditional least-squares estimate of θ given the first two observations is 3/8.

To find the forecast for Y3, we can use the MA(1) model equation:

Y3 = μ + θε2 + ε3

where ε2 and ε3 are unobserved error terms. Substituting the estimated value of θ and the given value of Y2, we get:

Y3 = (3/8)(-1) + ε3 = -3/8 + ε3

Therefore, the forecast for Y3 is -3/8.

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a) The simple interest for the loan is $927.19.

b) The total amount that Jax will have to pay at the end of 30 months is $9,427.19.

a) To calculate the simple interest for the loan, we can use the formula:

Simple Interest = Principal x Rate x Time

where Principal is the amount borrowed, Rate is the annual interest rate, and Time is the duration of the loan in years.

Since the loan is for 30 months, which is equivalent to 2.5 years, we can substitute the given values:

Simple Interest = 8,500 x 0.0435 x 2.5 = $927.19

b) To determine the total amount that Jax will have to pay at the end of 30 months, we need to add the simple interest to the original amount borrowed. The total amount can be calculated using the formula:

Total Amount = Principal + Simple Interest

Substituting the given values:

Total Amount = 8,500 + 927.19 = $9,427.19

In summary, Jax will have to pay $927.19 in simple interest and a total of $9,427.19 at the end of 30 months to repay the 8,500 loan with an annual simple interest rate of 4.35%.

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To find CE, we first need to find the length of AE and EB. We know that AE = 2/3 AB and EB = 1/3 AB, so AE = 4 and EB = 2.

Now we can use the Law of Cosines to find the length of AC:

AC^2 = AB^2 + BC^2 - 2AB*BC*cos(A)

Plugging in the given values, we get:

AC^2 = 6^2 + 5^2 - 2(6)(5)cos(A)

Simplifying:

AC^2 = 61 - 60cos(A)

We also know that AC = 4, so we can set these two equations equal to each other and solve for cos(A):

4^2 = 61 - 60cos(A)

16 = 60cos(A) - 61

77 = 60cos(A)

cos(A) = 77/60

Now we can use the Law of Cosines again to find CE:

CE^2 = AC^2 + AE^2 - 2AC*AE*cos(A)

Plugging in the values we know:

CE^2 = 4^2 + 4^2 - 2(4)(4)(77/60)

Simplifying:

CE^2 = 32/3

Taking the square root:

CE = sqrt(32/3)

Simplifying:

CE = 4sqrt(2/3)

Therefore, CE is approximately equal to 2.309.

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The guy wire is attached to the tower at a height of approximately 15.95 meters.

Length of the guy wire (hypotenuse) = 18.5 m

Angle between the ground and the guy wire = 59º

Using the sine function to find the height of the tower.
sin(angle) = height/hypotenuse

Putting in the known values and solving for the height.
sin(59º) = height/18.5 m
height = sin(59º) × 18.5 m

Calculating the height
height ≈ 15.95 m

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Answer:

The answer is the fourth option.

Step-by-step explanation:

The reason is that when a number has the line above it means it is continuous which is the meaning of rational numbers.

Arrange the data in an ascending order and the median is the middle value. If the number of values is an even number, the median will be the average of the two middle numbers.

median: 34

The mode is the element that occurs most in the data set. In this case, 13, 34 occurs 2 times.

mode: 13, 14

The mean of a set of numbers is the sum divided by the number of terms.

mean: 38.2

Subtract the minimum data value from the maximum data value to find the data range. In this case, the data range is

69−13=56.

Range: 56

The circle relation C defined on the set of real numbers is not reflexive and transitive but it is symmetric.

(a) C is not reflexive. To be reflexive, for every real number, xCx must hold true, meaning [tex]x^{2} + x^{2}[/tex]= 1. This is false. For example, let x=0. In this case, [tex]x^{2} + x^{2}[/tex] = 0, which does not equal 1. Therefore, C is not reflexive.

(b) C is symmetric.  If xCy then yCx, for all real numbers x and y. If we see the definition of C, this means that if [tex]x^{2} + y^{2}[/tex] = 1, then [tex]y^{2} + x^{2}[/tex] = 1. This is true due to the commutative property of addition ([tex]x^{2} + y^{2} = y^{2} + x^{2}[/tex] for all real numbers x and y). Thus, C is symmetric.

(c) C is not transitive. To be transitive, if xCy and yCz, then xCz must hold true for all real numbers x, y, and z. This means that if [tex]x^{2} + y^{2}[/tex] = 1 and [tex]y^{2} + z^{2}[/tex] = 1, then [tex]x^{2} + z^{2}[/tex]must equal 1. This is not always true. Let's take an example (x, y, z) = (1, 0, -1). Then [tex]x^{2} + y^{2}[/tex] = 1, [tex]y^{2} + z^{2}[/tex]= 1, but [tex]x^{2} + z^{2}[/tex] = 2, not 1. Thus, C is not transitive.

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Answer:

1/7

Step-by-step explanation:

7/7-3/7=4/7

[tex]\frac{4}{7} /2[/tex]=2/7

4/7+2/7=6/7

7/7-6/7=1/7

So the housewife has 1/7 of the money left

The table should be completed with the correct key features as follows;

Axis of symmetry (1st graph): x = 1.

Vertex (1st graph): (1, -9).

Minimum (1st graph): -9.

y-intercept (1st graph): (0, -8).

Axis of symmetry (2nd graph): x = 2.

Vertex (2nd graph): (2, 16).

Maximum (2nd graph): 16.

y-intercept (2nd graph): (0, 12).

In Mathematics and Geometry, the graph of a quadratic function would always form a parabolic curve because it is a u-shaped. Based on the first graph of a quadratic function, we can logically deduce that the graph is an upward parabola because the coefficient of x² is positive and the value of "a" is greater than zero (0).

Based on the second graph of a quadratic function, we can logically deduce that the graph is a downward parabola because the coefficient of x² is negative and the value of "a" is less than zero (0).

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(a)The linear function that models the monthly cost C as a function of the distance driven d is:

C(d) = 0.25d + 260

(b) we predict that it would cost $625 per month to drive 1,500 miles.

A linear function is simple and easy to interpret, which makes it a useful model for practical purposes.

(a) Let's use the two data points to find the equation of the line that models the monthly cost as a function of the distance driven. The slope of the line is the change in cost over the change in distance, so we have:

slope = (460 - 380) / (800 - 480) = 80 / 320 = 0.25

The y-intercept is the cost when no distance is driven, so we have:

y-intercept = 380 - 0.25 * 480 = 260

(b) To predict the cost of driving 1,500 miles per month, we simply plug in d = 1500 into the linear function we found in part (a):

C(1500) = 0.25(1500) + 260 = $625

Therefore, we predict that it would cost $625 per month to drive 1,500 miles.

(c) The graph of the linear function is a straight line with slope 0.25 and y-intercept 260. The slope represents the rate of change of the cost with respect to the distance driven. In other words, for each additional mile driven, the cost increases by $0.25.

The y-intercept represents the fixed cost of driving the car, which includes expenses such as insurance and maintenance that do not depend on the distance driven.

(d) The y-intercept represents the fixed cost of driving the car, which includes expenses such as insurance and maintenance that do not depend on the distance driven.

(e) A linear function gives a suitable model in this situation because the relationship between the monthly cost and the distance driven is approximately linear over the range of distances we have data for. Additionally, a linear function is simple and easy to interpret, which makes it a useful model for practical purposes.

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1. Determine the equilibrium price and quantity: This is the point where the supply curve and the demand curve intersect.
2. This triangle represents the producers' surplus. To find its area, use the formula for the area of a triangle:

(base × height) / 2.

To find the producers' surplus, we need to first determine the equilibrium price at which the supply and demand curves intersect. At this price, the quantity supplied by producers will equal the quantity demanded by consumers.

Once we have the equilibrium price, we can then calculate the area between the supply curve and the equilibrium price. This represents the producers' surplus, which is the amount of profit they make on each unit sold above their cost of production.

Without knowing the specific supply and demand curves, it is not possible to provide an exact answer to this question. However, we can use the formula for producers' surplus to calculate an approximate answer:

Producers' Surplus = (Equilibrium Price - Minimum Supply Price) x Quantity Supplied

For example, if the equilibrium price is $5.50 and the minimum supply price is $3.00, and the quantity supplied is 100 units, the producers' surplus would be:

Producers' Surplus = ($5.50 - $3.00) x 100
Producers' Surplus = $2.50 x 100
Producers' Surplus = $250.00

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