There are 12 DVDs, 7 video games, 14 CDs, and 3 videotapes on Jamie’s bedroom shelf. If Jamie selects an item at random from the shelf, what is the probability that it is a DVD or video tape?

The mean of the total withdrawals in 8 hours is $2400 and the standard deviation is approximately $178.89.

To find the mean of the total withdrawals in 8 hours, we first need to find the mean of withdrawals per hour. Since the rate of customers arriving at the ATM is 10 per hour, we can assume that there are also 10 withdrawals per hour. Therefore, the mean of withdrawals per hour is 10 x $30 = $300.

To find the mean of total withdrawals in 8 hours, we can multiply the mean of withdrawals per hour by the number of hours: $300 x 8 = $2400.

To find the standard deviation of total withdrawals in 8 hours, we need to use the formula: standard deviation = square root of (variance x n), where variance is the square of standard deviation and n is the number of observations.

The variance of withdrawals per hour can be calculated as follows:

Variance = (standard deviation)^2 = $20^2 = $400

Therefore, the variance of total withdrawals in 8 hours is:

Variance = $400 x 8 = $3200

And the standard deviation of total withdrawals in 8 hours is:

Standard deviation = square root of ($3200 x 1) = $56.57

So, the mean of total withdrawals in 8 hours is $2400 and the standard deviation is $56.57.
Hello! I'd be happy to help you with this question. To find the mean and standard deviation of the total withdrawals in 8 hours, we'll first determine the expected number of customers and then use the given information about the mean and standard deviation of the withdrawals.

1. Determine the expected number of customers in 8 hours: Since customers arrive at a rate of 10 per hour, in 8 hours we can expect 10 * 8 = 80 customers.

2. Calculate the mean of total withdrawals: Multiply the mean withdrawal per transaction by the expected number of customers. The mean withdrawal is $30, so the mean of total withdrawals in 8 hours is 80 * $30 = $2400.

3. Calculate the variance of total withdrawals: Since the withdrawals are independent, we can multiply the variance of individual withdrawals by the expected number of customers. The variance is the square of the standard deviation, which is $20^2 = $400. The variance of total withdrawals in 8 hours is 80 * $400 = $32,000.

4. Calculate the standard deviation of total withdrawals: Take the square root of the variance. The standard deviation is √$32,000 ≈ $178.89.

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Answer:

Step-by-step explanation:

We can use the Binomial Theorem to show this by letting a=3 and b=2 in the formula:

(a+b)^n = ∑(n choose k) a^(n-k) b^k

Substituting the values of a and b, we get:

(3+2)^n = ∑(n choose k) 3^(n-k) 2^k

5^n = ∑(n choose k) 3^(n-k) 2^k

Multiplying both sides by (-1)^n, we get:

(-1)^n 5^n = ∑(n choose k) (-1)^n 3^(n-k) 2^k

(-1)^n 5^n = ∑(n choose k) (-1)^k 3^(n-k) 2^k

Using the property that (n choose k) = (n choose n-k), we can simplify the expression:

(-1)^n 5^n = ∑(n choose n-k) (-1)^(n-k) 3^(k) 2^(n-k)

(-1)^n 5^n = ∑(n choose k) (-1)^(n-k) 3^(k) 2^(n-k)

We recognize the sum on the right-hand side as the expansion of (3-2)^n:

(-1)^n 5^n = (3-2)^n = ∑(n choose k) (-1)^(n-k) 3^(k) 2^(n-k)

Rearranging, we get:

∑(n choose k) (-1)^k 3^(n-k) 2^k = 5^n

Dividing both sides by 5^n, we get:

∑(n choose k) (-1)^k (3/5)^(n-k) (2/5)^k = 1

We recognize the left-hand side as a binomial expansion with coefficients (n choose k) and terms (3/5)^(n-k) and (2/5)^k. Therefore, the sum of these terms must equal 1, by the Binomial Theorem. This verifies the result.

The solution to the given differential equation y' = x(1 + y), with the constraint y > -1, can be expressed in terms of different functions and constants. The possible solutions are: y = sin(x) + a, y = 3x² + Cc, y = Ce^(x²/2) - 1, y = 1/2e^(x²) + Ce, and y = C√x + 3, where a, Cc, and Ce are constants.

Given the differential equation: y' = x(1 + y), where y > -1, we can solve it as follows:

y = sin(x) + a:

We can rewrite the given equation as y' = x + xy. Separating variables, we get: (1 + y)dy = xdx. Integrating both sides, we obtain: ∫(1 + y)dy = ∫xdx. This yields: y + y²/2 = x²/2 + C1, where C1 is a constant of integration. Solving for y, we get: y = x²/2 + C1 - y²/2. Substituting y = sin(x) + a, we get: sin(x) + a = x²/2 + C1 - (sin(x) + a)²/2. Rearranging and simplifying, we get: sin(x) + a = x²/2 + C1 - (sin²(x) + 2asinx + a²)/2. Finally, solving for y, we obtain: y = sin(x) + a.

y = 3x² + Cc:

We can directly integrate the given equation with respect to x, which yields: y = 3x² + Cc, where Cc is a constant of integration.

y = Ce^(x²/2) - 1:

We can rewrite the given equation as y'/(1 + y) = x. Separating variables, we get: dy/(1 + y) = xdx. Integrating both sides, we obtain: ∫dy/(1 + y) = ∫xdx. This yields: ln|1 + y| = x²/2 + C2, where C2 is a constant of integration. Exponentiating both sides, we get: 1 + y = e^(x²/2 + C2). Rearranging, we obtain: y = Ce^(x²/2) - 1, where C is a constant.

y = 1/2e^(x²) + Ce:

We can directly integrate the given equation with respect to x, which yields: y = 1/2e^(x²) + Ce, where Ce is a constant of integration.

y = C√x + 3:

We can directly integrate the given equation with respect to x, which yields: y = C√x + 3, where C is a constant.

Therefore, the solutions to the given differential equation y' = x(1 + y), with the constraint y > -1, are: y = sin(x) + a, y = 3x² + Cc, y = Ce^(x²/2) - 1, y = 1/2e^(x²) + Ce, and y = C√x + 3, where a, Cc, and Ce are constants.

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This is the equation of a hyperbola with center (3, -3), vertices (1, -3) and (5, -3), and passing through the point (-3, 5).

To find the standard form of the equation of the hyperbola, we need to first determine the center of the hyperbola. The center is the midpoint of the line segment connecting the vertices, which is:

((1+5)/2, (-3-3)/2) = (3, -3)

So the center is (3, -3). Next, we need to determine the distance between the center and each vertex, which is called the distance between the center and the foci. The distance between the center and each vertex is 4, so the distance between the foci is:

c = √(a² + b²), where a = 4 and b is the distance between the center and either vertex

b = 3, so c = √(4² + 3²) = 5

Now we have all the information we need to write the standard form of the equation of the hyperbola:

[(x - 3)² / 4²] - [(y + 3)² / 5²] = 1

This is the equation of a hyperbola with center (3, -3), vertices (1, -3) and (5, -3), and passing through the point (-3, 5).

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The amount of fencing, dirt and sod for the baseball field are: length of Fencing & 1410.5 ft. Area of the sod ≈ 118017.13ft² Area of the field covered with dist ≈ 7049.6ft²

Area of a circle = πr²

Circumference of a circle = 2πr

where r is the radius of the circle

The area of a Quarter of a circle is therefore;

Area of a circle/ 4

The perimeter of a Quarter of a Circle is;

The perimeter of a circle/4

Fencing = ¼ x 2 x π x 380 + 2 x 15 +2 x 380 + ¼ x 2 x π x 15

Fencing = 197.5π + 190π = 1410.5 feet.

Grass =

π/4 x (380 - 6)² + 87 ² - π/4 × (87 + 30)² + 2 x 380 x 15 + π/4 x 15² - (3/4) x π x 10² - 25π

= 31528π + 18969 = 118017.13

The area Covered by the sod is about 118017.13Sq ft.

Dirt = π/4 x 380 ² - π/4 x (380 - 6)² + π/4 (87 + 30)² - 87² + π100 = (18613π - 30276)/4

= 7049.6

The area occupied by the dirt is about 7049.6 Sq feet

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Answer:

2 hours 30 mins

Step-by-step explanation:

We Know

Caleb and his friends went to see a movie at 7:35 p.m.

They left at 10:05

How long was the movie?

We Take

10:05 - 7:35 = 2 hours 30 mins

So, the movie is 2 hours 30 mins long.

The total surface area of the part of the cylinder that lies between the xy-plane and the plane is:

S = π[tex]r^2[/tex] + 2πr√[tex](r^2 + (c-a)^2)[/tex]

The answer has the form πr(r + a + √(r^2 + (c-a)^2)), where a is the distance from the xy-plane to the plane.

To find the surface area of the part of the cylinder that lies between the xy-plane and the plane, we first need to determine the equations of the cylinder and the plane. Let's assume that the cylinder has radius r and height h, and its center lies on the z-axis at point (0, 0, c). The equation of the cylinder can be written as:

[tex]x^2 + y^2 = r^2[/tex]

and the equation of the plane can be written as:

z = a, where a is the distance from the xy-plane to the plane.

To find the surface area of the part of the cylinder that lies between the xy-plane and the plane, we need to calculate the area of the circular base (which lies on the xy-plane) and the curved surface area (which lies between the plane and the base).

The area of the circular base is simply π[tex]r^2[/tex].

To calculate the curved surface area, we need to project the curved surface onto the xy-plane and find its length. We can do this by considering a right triangle with sides r (the radius of the cylinder) and c-a (the distance from the center of the cylinder to the plane). The length of the hypotenuse of the triangle is given by:

l = √[tex](r^2 + (c-a)^2)[/tex]

The projection of the curved surface onto the xy-plane is a circle with radius l. Therefore, the curved surface area is:

A = 2πrl

Substituting l and simplifying, we get:

A = 2πr√[tex](r^2 + (c-a)^2)[/tex]

Therefore, the total surface area of the part of the cylinder that lies between the xy-plane and the plane is:

S = πr^2 + 2πr√[tex](r^2 + (c-a)^2)[/tex]

The answer has the form πr(r + a + √[tex](r^2 + (c-a)^2)[/tex]), where a is the distance from the xy-plane to the plane.

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Answer: Right triangle

Step-by-step explanation:

Every right triangle has a 90 degree square that can fit in it.

:)

Acute triangles measure less than 90 degrees while obtuse goes over 90 degrees.  

The CDF of X for a constant parameter a > 0, a rayleigh random variable x is [tex]F_{X}(x) = 1 - e^{(-a^2x^2/2)[/tex] for x > 0, and 0 otherwise.

To find the CDF (Cumulative Distribution Function) of a Rayleigh random variable X with the given [tex]PDF f_X(x) = {a^2xe^{(-a^2x^2/2)[/tex] for x > 0, 0 otherwise}, we need to integrate the PDF from 0 to x. Here's the solution:

[tex]CDF F_X(x)[/tex] = ∫[tex][a^2xe^{(-a^2x^2/2)]}dx[/tex] from 0 to x

Let's denote u = [tex]a^2x^2/2[/tex]. Then, du = [tex]a^2xdx[/tex]. So the integral becomes:

[tex]F_X(x)[/tex] = ∫[tex][e^{(-u)}du][/tex] from 0 to [tex]a^2x^2/2[/tex]

Now, integrate [tex]e^{(-u)}[/tex] with respect to u:

[tex]F_X(x)[/tex] = [tex]-e^{(-u)[/tex] | from 0 to [tex]a^2x^2/2[/tex]

Evaluate the definite integral:

[tex]F_X(x)[/tex] = [tex]-e^{(-a^2x^2/2)} + e^{(0)} = 1 - e^{(-a^2x^2/2)[/tex]

Thus, the CDF of X is [tex]F_X(x)[/tex] = [tex]1 - e^{(-a^2x^2/2)[/tex] for x > 0, and 0 otherwise.

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The test, and it is not necessarily stronger for one-tailed tests compared to two-tailed tests

When the alternative hypothesis says that the average of the box is greater than the given value, this is known as a one-tailed test.

In a one-tailed test, we are only interested in whether the data falls in one direction, either above or below a certain value. In contrast, a two-tailed test is when we are interested in whether the data falls in either direction, above or below a certain value.

In terms of which test to use, it depends on the context and the research question. If the research question specifically asks whether the data falls above a certain value, then a one-tailed test may be more appropriate. However, if there is a possibility that the data could fall in either direction and we want to be able to detect a significant difference in either direction, then a two-tailed test may be more appropriate.

Regarding the strength of evidence required to reject the null hypothesis, it is not necessarily true that one-tailed tests require stronger evidence than two-tailed tests. The level of significance, or alpha, that we choose for the test is what determines the strength of evidence required to reject the null hypothesis.

For example, if we choose a significance level of 0.05, then we require evidence that there is less than a 5% chance that our results occurred by chance alone in order to reject the null hypothesis. This level of evidence is the same for both one-tailed and two-tailed tests, and it is up to the researcher to determine what level of significance is appropriate for their research question.

In conclusion, whether to use a one-tailed or two-tailed test depends on the research question and whether we are interested in detecting a significant difference in one direction or both directions. The strength of evidence required to reject the null hypothesis is determined by the level of significance chosen for the test, and it is not necessarily stronger for one-tailed tests compared to two-tailed tests.

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The limit of the sequence is ln(7) and the sequence converges to ln(7).

To determine the convergence of the sequence, we need to investigate the behavior of its terms as n approaches infinity.

We have:

[tex]an = ln(7n^2 + 3) − ln(n^2 + 3)[/tex]

To simplify this expression, we can use the property of logarithms that states [tex]ln(a) - ln(b) = ln(a/b)[/tex]:

[tex]an = ln[(7n^2 + 3)/(n^2 + 3)][/tex]

Now, let's investigate the behavior of the fraction inside the natural logarithm as n approaches infinity. We can use the fact that the leading term in the numerator and denominator dominates as n gets large:

[tex](7n^2 + 3)/(n^2 + 3) ≈ 7[/tex]

Therefore, as n approaches infinity, an approaches ln(7), which is a finite number. Thus, the sequence converges to ln(7).

Therefore, the limit of the sequence as n approaches infinity is:

[tex]lim n→∞ an = ln(7)[/tex]

Therefore, the limit of the sequence is ln(7) and the sequence converges to ln(7).

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Once you have computed the expected value, you can mark your guess on the graph by finding the point where the curve is balanced. This is the point where the area to the left of the point is equal to the area to the right of the point.

A probability density function is a function that describes the likelihood of a random variable taking on a certain value. The area under the curve of a probability density function must be equal to 1. The normalizing constant, denoted by k, is a constant that is multiplied by the probability density function to ensure that the area under the curve is equal to 1. In other words, k is the value that makes the integration of the probability density function equal to 1.

To find the value of k, you would need to integrate the probability density function over its entire range and set the result equal to 1. Once you have found k, you can sketch the density function by plotting the function on the y-axis and the possible values of x on the x-axis.

The expected value of a random variable is a measure of the center of its distribution. It represents the average value that the variable would take if it were repeated many times. To compute the expected value of a continuous random variable, you would need to integrate the product of the random variable and its probability density function over its entire range.

Once you have computed the expected value, you can mark your guess on the graph by finding the point where the curve is balanced. This is the point where the area to the left of the point is equal to the area to the right of the point.

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Answer:

The whole answer I've written after x needs to be in a square root sign.

x=77-3m/2

The / means a fraction sign

if you're confused lmk I'll explain

Hope it helps! x

Answer:

2x - 6 + 7x + 4 = 90

Step-by-step explanation:

We Know

It is a right angle, meaning 90°

2x - 6 + 7x + 4 must be equal to 90°

So, the answer is 2x - 6 + 7x + 4 = 90

The statement "if a treatment is expected to decrease scores in a population with µ= 30, then the alternative hypothesis is µ ≤ 30." is true.

The alternative hypothesis (H1) represents a claim that contradicts the null hypothesis (H0). In this case, the null hypothesis would be that the treatment has no effect or increases scores, stated as µ≥30. The alternative hypothesis, µ≤30, suggests that the treatment is expected to decrease the population scores.

In hypothesis testing, we compare the observed data to these hypotheses to determine if there's enough evidence to support the claim made by the alternative hypothesis. By stating µ≤30, we are considering the possibility that the treatment may lead to a decrease in the population scores.

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If you think the relationship between the LHS (Left Hand Side) variable and a RHS (Right Hand Side) variable is non-linear, you can/should:

1. Transform the variables: Apply transformations, such as logarithmic, exponential, or power transformations, to make the relationship more linear.

2. Use non-linear regression models: Consider using non-linear regression models, like polynomial, exponential, or logistic regression, to better capture the non-linear relationship.

3. Include interaction terms: Add interaction terms between RHS variables to your model to capture the combined effect of two or more variables on the LHS variable.

By following these steps, you can better account for the non-linear relationship between the LHS variable and the RHS variable in your analysis.

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Without knowledge of the distribution of x, we cannot make any further calculations.

Without additional information about the distribution of variable x, we cannot determine p(2.5 < x < 6.5).

If we know the distribution, we could use the probability density function (PDF) or cumulative distribution function (CDF) to calculate the probability. For example, if x is a normally distributed variable with mean 5 and standard deviation 1, we could use the standard normal distribution to find:

p(2.5 < x < 6.5) = p((2.5-5)/1 < (x-5)/1 < (6.5-5)/1)

= p(-2.5 < z < 1.5)

= Φ(1.5) - Φ(-2.5)

≈ 0.7745 - 0.0062

≈ 0.7683

But without knowledge of the distribution of x, we cannot make any further calculations.

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Let's find the domain and codomain for each of the given matrices.

(a) The given matrix product is: [ 6 3 ] [x1] [-1 7 ] [x2]

The domain of a transformation is the set of all possible input vectors. In this case, the input vector is [x1, x2]. Since there are no restrictions on the values of x1 and x2, the domain is all real numbers for both components.

Mathematically, the domain is R^2, where R represents the set of all real numbers. The codomain of a transformation is the set of all possible output vectors. The given transformation is a 2x2 matrix, which means it maps R^2 to R^2.

Thus, the codomain is also R^2.

(b) The given matrix product is: [ 2 1 -6 ] [x1] [ 3 7 -4 ] [x2] [ 1 0 3 ] [x3]

The domain of this transformation is the set of all possible input vectors. In this case, the input vector is [x1, x2, x3]. Since there are no restrictions on the values of x1, x2, and x3, the domain is all real numbers for each component.

Mathematically, the domain is R^3. The codomain of this transformation is the set of all possible output vectors. The given transformation is a 3x3 matrix, which means it maps R^3 to R^3.

Thus, the codomain is also R^3.

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The probability that a student has a dog, given that they do not have a cat is 5/6.

The probability that a student has a dog given that they do not have a cat is :

P ( Has a dog | Does not have a cat ) = P ( Has a dog and does not have a cat) / P ( Does not have a cat )

Total number of students = 11 + 10 + 5 + 2 = 28

P ( Has a dog | Does not have a cat ):

= (10 / 28) / (12 / 28)

= 10 / 12

= 5 / 6

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Answer:

A) Slope=1

Step-by-step explanation:

To find the slope of the line passing through the points (2, 3) and (4, 5), we can use the slope formula:

slope = (y2 - y1) / (x2 - x1)

where (x1, y1) = (2, 3) and (x2, y2) = (4, 5).

Plugging in the values, we get:

slope = (5 - 3) / (4 - 2)

= 2 / 2

= 1

Therefore, the slope of the line is 1. Answer: A) 1.

Answer

m = 1

In-depth Explanation

To calculate slope, we use the formula

Where m is the slope and (y2, y1)( x2, x1) are points on the line.

Calculating :

Therefore, the slope is m = 1

The probability of getting between 3 and 5 successes (inclusive) in 8 trial is approximately 0.6309.

We can use the binomial probability formula to calculate the probability:

P(3 ≤ x ≤ 5) = P(x = 3) + P(x = 4) + P(x = 5)

where [tex]P(x) = (n choose x) * p^x * (1 - p)^{(n - x)}[/tex]

In this case, n = 8 and p = 0.62, so we have:

P(3 ≤ x ≤ 5) = [tex](8 choose 3) * 0.62^3 * (1 - 0.62)^(8 - 3) + (8 choose 4) * 0.62^4 * (1 - 0.62)^{(8 - 4)} + (8 choose 5) * 0.62^5 * (1 - 0.62)^{(8 - 5)}[/tex]

Using a calculator or software, we can compute this expression to get:

P(3 ≤ x ≤ 5) ≈ 0.6309

Therefore, the probability of getting between 3 and 5 successes (inclusive) in 8 trials with a success probability of 0.62 is approximately 0.6309.

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The f-statistic use to test the hypothesis.is 34.719264.

To calculate the F-statistic for testing the overall significance of the linear regression model,

we need to compare the regression sum of squares (SSR) to the residual sum of squares (SSE) and the degrees of freedom associated with each.

The formula for the F-statistic is:

F = (SSR / k) / (SSE / (n - k - 1))

where k is the number of predictor variables in the model, and n is the sample size.

Since the question does not provide the values of k and n, I will assume that k = 1 (simple linear regression) and use the information given in the previous question to find n.

From the previous question, we have:

SSE = 24.074572

MSE = SSE / (n - 2) = 2.674952

SSTO = SSR + SSE = 83.820408

R-squared = SSR / SSTO = 0.7136

We can use R-squared to find SSTO:

SSTO = SSR / R-squared = 83.820408 / 0.7136 = 117.539337

Then, we can use SSTO and MSE to find n:

SSTO / MSE = n - 2

117.539337 / 2.674952 = n - 2

n = 45

Now we can substitute the values of k, n, SSR, and SSE into the formula for the F-statistic:

F = (SSR / k) / (SSE / (n - k - 1))

F = ((117.539337 - 83.820408) / 1) / (24.074572 / (45 - 1 - 1))

F = 34.719264

Therefore, the F-statistic is 34.719264.

This value can be used to test the hypothesis that the slope coefficient is equal to zero, with a significance level determined by the degrees of freedom and the chosen alpha level.

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a) y = -0.75x + 25 approximate equation of the line of best fit for the data.

b) The prediction for time spent doing homework for someone who spends 12 hours watching TV is 16 hours.

a) I added the graph to Desmos, online graphic calculator and superimposed a line which I think is a good/decent fit to the given data. Image for reference:

Thus, we get the line of best fit (approximately) equation as

y = -0.75x + 25 (in equation)

b)  From the given equation, the prediction for time spent doing homework for someone who spends 12 hours watching TV is

y = -0.75x + 25.

y = -0.75(12) + 25

y = -9 + 25

y = 16

Thus, the prediction for time spent doing homework for someone who spends 12 hours watching TV is 16 hours.

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Find the volume of a pyramid with a square base, where the perimeter of the base is 18.2 in and the height of the pyramid is 10.9 in. Round your answer to the nearest tenth of a cubic inch.

Based on the information given, we can assume that "x" represents the price of sandwiches, and "demand" refers to the quantity of sandwiches that consumers are willing and able to buy at that particular price. The term "market" refers to the overall demand for sandwiches in the entire market, rather than just one individual consumer.

If x = 1, we can look at the table to see that the quantity demanded is 6 sandwiches. We can use this information to calculate the slope of the market demand curve, which represents the relationship between the price of sandwiches and the quantity demanded by all consumers in the market.

To calculate the slope, we need to find two points on the demand curve. Let's use the points (1,6) and (2,4), since they are the closest to x=1. We can use the slope formula:

slope = (y2 - y1) / (x2 - x1)

slope = (4 - 6) / (2 - 1)

slope = -2

So the slope of the market demand curve when the price is on the vertical axis is -2. However, none of the answer choices given match this result.

The closest answer is (b) -1/3, but this is not correct based on the calculations we just did.

Therefore, the correct answer cannot be determined with the information given.

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The derivate f'(a) when the point (a, b) is a local minimum. In this case, the correct answer is: d. It's zero

When a point (a, b) is a local minimum, the derivative f'(a) will be zero. This is because, at a local minimum, the function changes its direction from decreasing to increasing, and the slope of the tangent line is zero.

If the point (a,b) is a local minimum of a differentiable function f, then f'(a) = 0.

This is because at a local minimum, the slope of the tangent line to the graph of f at point (a,b) is zero (since the derivative f'(x) gives the slope of the tangent line at point x). If the slope of the tangent line at point (a,b) is zero, then the derivative f'(a) must also be zero.

Therefore, the correct answer is (d) it's zero

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Answer:

0.00446

Step-by-step explanation:

1 decailiters = 10,000 milliliters.

44.6 / 10,000= 0.00446

The value of x from the mean age is 38

The mean age is 47

The age of the five singers are 55,52,50,x and 40

The value of x can be calculated as follows

55 + 52 + 50 + x + 40/5= 47

cross multiply both sides

55 + 52 + 50 + x + 40=235

collect the like terms

157 + 40 + x= 235

197 + x= 235

x= 235-197

x= 38

The value of x is 38

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If a sample contains 12.5% parent, 3 half lives are passed and if the radioactive pair is K-40 and Ar-40,  the actual age of the sample is 3.75 billion years.

If a sample contains 12.5% parent, it means that 3 half-lives have passed. To calculate the actual age of the sample with the radioactive pair K-40 and Ar-40, you need to know the half-life of K-40, which is 1.25 billion years. The actual age of the sample can be found by multiplying the half-life by the number of half-lives passed: 1.25 billion years * 3 = 3.75 billion years. Therefore, the actual age of the sample is 3.75 billion years.

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