It a class of 50 students, 3/5 are girals. How many boys are there in the class?

Yes, a probability model based on Bernoulli trials can be used to model the outcome of this game.

In this scenario, the Bernoulli trials are the 7 dice rolls for each Avenger, with the probability of success (rolling a 2) being 1/6, and the probability of failure (rolling any other number) being 5/6. The rolls are independent of each other, and there are only two outcomes for each roll: rolling a 2 or not rolling a 2.

Each roll of the dice can be considered a Bernoulli trial, where success is defined as rolling a 2 and failure is defined as rolling any other number. The probability of success (rolling a 2) is 1/6, and the probability of failure (rolling any other number) is 5/6. The rolls of the dice are assumed to be independent of each other, and the game ends once a player reaches the goal of three 2's. Therefore, the situation satisfies the requirements for a Bernoulli trial and a probability model based on Bernoulli trials can be used to investigate the outcome of this game.

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Using a two-sample proportion test with a significance level of 0.05, the null hypothesis that the proportion of successful challenges is the same for men and women was tested. The result indicates that there is not sufficient evidence to reject the null hypothesis.

To test the claim that men and women have equal success in challenging calls, we can use a hypothesis test. Our null hypothesis is that the proportion of successful challenges is the same for men and women, and our alternative hypothesis is that the proportions are different.

(a) We can set up our hypotheses as follows:

H0: p1 = p2 (the proportion of successful challenges is the same for men and women)

Ha: p1 ≠ p2 (the proportions are different)

where p1 is the proportion of successful challenges for men and p2 is the proportion of successful challenges for women.

(b) We can calculate the pooled proportion of successful challenges:

p = (x1 + x2) / (n1 + n2)

where x1 = 417, n1 = 1405 for men and x2 = 225, n2 = 750 for women.

p = (417 + 225) / (1405 + 750) = 0.278

(c) We can calculate the test statistic using the formula:

z = (p1 - p2) / sqrt(p * (1 - p) * (1/n1 + 1/n2))

where p1 = 417/1405, p2 = 225/750.

z = (0.297 - 0.3) / sqrt(0.278 * 0.722 * (1/1405 + 1/750)) = -0.455

Using a standard normal distribution table or calculator, the p-value for this test is 0.649. Since the p-value is greater than the significance level of 0.05, we fail to reject the null hypothesis.

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The total amount of the finance charge is $328.11

Given that, we have the following readings from the question

Using the table as a guide, we have rate to calculate the finance charge to be

Rate = 0.09263

The total amount of the finance charge is then calculated as

Total amount = Amount * Rate

By substitution, we have

Total amount = $3542.18 * 0.09263

Evaluate the products

So, we have

Total = $328.11

Hence, the total is $328.11

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The solution to the differential equation y′′=2eˣ+10 with initial conditions y′(0)=2 and y(2)=2e² is y(x) = eˣ + 5x² + (2e² - 29)x, and y(3) = e³ + 6e² - 42.

The given differential equation is y′′=2eˣ+10, with initial conditions y′(0)=2 and y(2)=2e². We can solve this equation using integration techniques.

First, we integrate the differential equation with respect to x once to obtain the first derivative y′(x):

y′(x) = ∫(2eˣ + 10) dx

y′(x) = 2eˣ + 10x + C₁

where C₁ is a constant of integration.

Next, we integrate y′(x) with respect to x again to obtain the original function y(x):

y(x) = ∫(2eˣ + 10x + C₁) dx

y(x) = eˣ + 5x² + C₁x + C₂

where C₂ is another constant of integration.

Using the initial condition y′(0)=2, we can solve for C₁:

y′(0) = 2 = 2e⁰ + 10(0) + C₁

C₁ = 0

Using the second initial condition y(2)=2e², we can solve for C₂:

y(2) = 2e² = e² + 5(2²) + 0 + C₂

C₂ = 2e² - 29

Therefore, the final solution is:

y(x) = eˣ + 5x² + (2e² - 29)x

Finally, we can use this solution to find y(3):

y(3) = e³ + 5(3²) + (2e² - 29)(3)

y(3) = e³ + 45 + 6e² - 87

y(3) = e³ + 6e² - 42

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Eve can choose any value of s, compute the corresponding value of m, and then claim that s is the signature of m. Since the verification equation holds for this value of s and m, the signature will be declared valid.

What is quadratic formula ?

The quadratic formula is a formula used to solve quadratic equations of the form [tex]ax^2 + bx + c = 0[/tex], where a, b, and c are constants and x is the unknown variable.

a. To show that the signature is declared valid whether or not Nelson follows the correct signing procedure, we need to show that the verification equation holds for any value of s.

Expanding the verification equation, we get:

[tex]s^2 - (m + 8)s + 52 - m^2 = 0[/tex]

This is a quadratic equation in s. We can solve for s using the quadratic formula:

[tex]s =\frac{(m + 8) ±\sqrt{(m + 8)^2 - 4(52 - m^2)} }{2}[/tex]

Note that the term under the square root simplifies to

([tex]m^2 + 16m + 64) - (208 - 4m^2) = -3m^2 + 16m - 144.[/tex]

Since the verification equation involves only s and m, and not n, e, or d, the equation holds for any value of s that Nelson computes, whether or not he follows the correct procedure. Therefore, the signature is declared valid.

b. To forge Nelson's signature on any document m, Eve needs to compute an s such that the verification equation holds. Since the equation involves only s and m, Eve can choose any value of s and then solve for m.

Using the quadratic formula from part (a), we can solve for m in terms of s:

[tex]m =\frac{ -8 ± \sqrt{(s^2 - 4s + 144)} }{2}[/tex]

Note that the term under the square root simplifies to[tex](s - 2)^2 + 112.[/tex]

Therefore, Eve can choose any value of s, compute the corresponding value of m, and then claim that s is the signature of m. Since the verification equation holds for this value of s and m, the signature will be declared valid.

This shows that the verification equation is not a secure way to verify signatures, since Eve can forge a signature without knowing the private key d.

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If the true means of the k populations are equal, then MSTR/MSE should be close to 1.00. This can be answered by the concept from ANOVA.

The ratio MSTR/MSE is used in analysis of variance (ANOVA) to determine the variation between means of different populations (MSTR) compared to the variation within each population (MSE).

If the true means of the k populations are equal, then MSTR, which represents the variation between means, should be small or close to zero, because there is little difference between the means. On the other hand, MSE, which represents the variation within each population, would still capture the random variation within each population.

Therefore, the ratio MSTR/MSE would be close to 1.00, indicating that the variation between means is similar to the variation within each population

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The z-coordinate of the center of mass for the solid S is 1/4.

To find the z-coordinate of the center of mass (z_c), we need to use the formula z_c = (1/M)∫∫∫ z dV, where M is the total mass and dV is the volume element.

Since the solid S is bounded by the paraboloid z = x² + y² and the plane z = 1, we'll integrate over the region in cylindrical coordinates, with z ranging from the paraboloid (z = r²) to the plane (z = 1), r ranging from 0 to 1, and θ ranging from 0 to 2π.

The volume element dV = r dz dr dθ, and the density is 1, so z_c = (1/2)∫∫∫ r² dz dr dθ. Solving the integral, we find that the z-coordinate of the center of mass for the solid S is 1/4.

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This hyperbola has a vertical transverse axis, with center at (3, -2), vertices at (3, 8) and (3, -12), and foci at (3, 4) and (3, -6).

How to solve the question?

To find the equation of the hyperbola, we will use the standard form equation:

((y-k)²/a²) - ((x-h)²/b²) = 1

Where (h,k) is the center of the hyperbola, a is the distance from the center to the vertices along the transverse axis, and b is the distance from the center to the vertices along the conjugate axis.

From the given information, we know that the center of the hyperbola is at (3, -2), and that the transverse axis is vertical. This means that the vertices are located at (3, -2 + a) and (3, -2 - a), where a is the distance from the center to the vertices.

We are also given that the perimeter of the graphing aid rectangle is 32. Since the graphing aid rectangle is formed by the four points that are furthest from the center (i.e. the four vertices of the hyperbola), we can use this information to find a.

Letting b/a = 5/3, we know that b = (3/5)a. Using the fact that the perimeter of the graphing aid rectangle is 32, we can set up the equation:

2a + 2b = 32

Substituting b = (3/5)a, we get:

2a + 2(3/5)a = 32

Solving for a, we get:

a = 10

Now that we have a, we can find b:

b = (3/5)a = 6

Thus, the equation of the hyperbola is:

((y + 2)²/100) - ((x - 3)²/36) = 1

This hyperbola has a vertical transverse axis, with center at (3, -2), vertices at (3, 8) and (3, -12), and foci at (3, 4) and (3, -6).

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The value of the indefinite integral: S(-7secxtanx - 5sec²x)dx is -7ln|sec(x) + tan(x)| - 5x + 5ln|sec(x)| + C

To integrate the expression S(-7sec(x)tan(x) - 5sec²(x))dx, we first use the identity sec²(x) = 1 + tan²(x) to rewrite the second term as -5 - 5tan²(x). Then we can split the integral into two parts as follows: S(-7sec(x)tan(x) - 5sec²(x))dx = -7Ssec(x)tan(x)dx - 5S(1 + tan²(x))dx = -7sec(x)dx - 5x - 5tan(x)dx

Now we can integrate each part separately. The integral of sec(x) is ln|sec(x) + tan(x)| + C, and the integral of tan(x) is ln|sec(x)| + C. Therefore, S(-7sec(x)tan(x) - 5sec²(x))dx = -7ln|sec(x) + tan(x)| - 5x + 5ln|sec(x)| + C where C is the constant of integration.

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The finite number of terms in the series B, it is possible that B < A for the given function h. The correct answer is: A < B.

H is a positive, decreasing function, we have:

h(2) > h(3) > h(4) > ... > h(15) > h(16)

Therefore, we can write:

h(2) + h(3) + h(4) + ... + h(15) > ∫[tex]2^{16[/tex] h(x) dx > h(16) + h(15) + ... + h(3) + h(2)

Integrating both sides of this inequality, we get:

h(2)(2 - 1) + h(3)(3 - 2) + h(4)(4 - 3) + ... + h(15)(15 - 14) > ∫2^16 h(x) dx > h(16)(16 - 15) + h(15)(15 - 14) + ... + h(3)(3 - 2) + h(2)(2 - 1)

Simplifying this, we get:

h(2) + 2h(3) + 3h(4) + ... + 14h(15) > ∫2^16 h(x) dx > h(16) + 2h(15) + 3h(14) + ... + 14h(3) + 15h(2)

Since h is a positive function, we can use the comparison test to compare the series B = Σ15 h(n) n=2 with the integral A = ∫16 h(x) dx 2 . Specifically, we have:

B = h(2) + h(3) + h(4) + ... + h(15) > A > h(16)

Therefore, we can conclude that:

B > A > h(16)

Since h is a continuous function and the interval [2, [infinity]) is unbounded, we have:

lim h(x) = 0

x→∞

Therefore, we can see that h(16) → 0 as x → ∞. This means that as the value of 16 becomes larger, the difference between B and A becomes smaller.

However, since we only have a finite number of terms in the series B, it is possible that B < A for the given function h. Therefore, the correct answer is:

A < B

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Alonzo rode the scooter for 44 minutes.

Let the fee to start the scooter be F, and let the cost per minute of the ride be C. We are given that Alonzo's total bill for the ride is T. With this knowledge, we can construct the following equation:

T = F + Cm

where m is the number of minutes Alonzo rode the scooter. We want to solve for m.

To find m, we may rewrite the equation as follows:

m = (T - F)/C

Therefore, the number of minutes Alonzo rode the scooter is (T - F)/C.

For example, let's say the fee to start the scooter is $2.50, and the cost per minute of the ride is $0.15. If Alonzo's total bill for the ride was $9.20, then we can plug these values into the equation above to find the number of minutes Alonzo rode the scooter:

m = (T - F)/C = (9.20 - 2.50)/0.15 = 44

Therefore, Alonzo rode the scooter for 44 minutes.

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A′(x) = 7 ln(x) and in second part is  A′(x) = 372 arctan(x). In both parts (a) and (b), we need to use the Fundamental Theorem of Calculus, which relates to differentiation and integration.

If f(x) is continuous on [a, b] and F(x) is an antiderivative of f(x), then the definite integral of f(x) from a to b is F(b) - F(a):
∫[a to b] f(x) dx = F(b) - F(a)
Part (a):
Using the Fundamental Theorem of Calculus, we have:
A(x) = ∫[0 to x] 7 ln(t) dt
To find A′(x), we need to differentiate A(x) with respect to x:
A′(x) = d/dx [ ∫[0 to x] 7 ln(t) dt ]
Using the Chain Rule for differentiation, we get:
A′(x) = 7 ln(x) * d/dx(x) = 7 ln(x)
Therefore, A′(x) = 7 ln(x).

Part (b):
Using the Fundamental Theorem of Calculus, we have:
A(x) = ∫[0 to x] 372 arctan(t) dt
To find A′(x), we need to differentiate A(x) with respect to x:
A′(x) = d/dx [ ∫[0 to x] 372 arctan(t) dt ]
Using the Chain Rule for differentiation, we get:
A′(x) = 372 arctan(x) * d/dx(x) = 372 arctan(x)
Therefore, A′(x) = 372 arctan(x).

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The rationalization of the denominator gives [tex]\frac{a \;+\; 4\sqrt{ay}\;+\; 4y}{a\;-\;4y}[/tex].

In Mathematics and Geometry, a rational expression simply refers to a type of expression which is expressed as a fraction. Thus, a rational expression is composed of two (2) main parts and these include the following:

Numerator

Denominator

In Mathematics and Geometry, a conjugate can be defined as a type of expression that is typically formed by changing the mathematical operation sign (symbol) between two (2) terms in an original binomial algebraic expression.

In order to rationalize the denominator, we would have to multiply both the numerator and denominator by the conjugate as follows;

[tex]\frac{\sqrt{a} \;+ \;2\sqrt{y} }{\sqrt{a} \;- \;2\sqrt{y}} \times \frac{\sqrt{a} \;+ \;2\sqrt{y}}{\sqrt{a} \;+ \;2\sqrt{y}}\\\\\frac{\sqrt{a} (\sqrt{a} ) \;+\; \sqrt{a} (2\sqrt{y}) \;+ \;\sqrt{a} (2\sqrt{y})\; + \;2\sqrt{y}(2\sqrt{y}) }{\sqrt{a} (\sqrt{a} ) \;-\; \sqrt{a} (2\sqrt{y}) \;+ \;\sqrt{a} (2\sqrt{y})\; - \;2\sqrt{y}(2\sqrt{y})} \\\\\frac{a \;+\; 4\sqrt{ay}\;+\; 4y}{a\;-\;4y}[/tex]

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The given statement: When a construction company bids on a contract, the events will be win or lose. The closer the probability is to 0.50, the greater the uncertainty about whether the company will win or lose the bid is TRUE.

When the probability of winning a contract is closer to 0.50, it indicates that there is a greater level of uncertainty about whether the company will win or lose the bid.

A probability of 0.50 means that the chance of winning or losing is equal, and there is no clear indication of what the outcome will be. In such cases, the construction company may have to make a difficult decision on whether to bid on the contract or not, considering the level of uncertainty involved.

On the other hand, if the probability of winning is much higher or much lower than 0.50, the company can have a more confident expectation of whether they will win or lose the bid. Thus, the closer the probability is to 0.50, the more uncertain the outcome of the bid will be.

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The number tells that 68.26 percent of the scores fall between the mean and +9.99 raw score units around the mean. (option a).

A deviation score of +9.99 means that the data point is 9.99 units above the mean. Based on this, we can conclude that 68.26% of the scores fall between the mean and +9.99 raw score units around the mean.

This is because in a normal distribution, 68.26% of the data falls within one standard deviation from the mean. In this case, the standard deviation is +9.99 and -9.99 units from the mean. Therefore, 68.26% of the data falls within this range.

Therefore, the correct answer is option (a), which states that 68.26% of the scores fall between the mean and +9.99 raw score units around the mean.

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Answer:

167.12

Step-by-step explanation:

The correct answer for question 5 is (2/5)x^(5/2) - (1/3)x^(3/2) + √2x + c.

To find the correct answer for question 5, we need to find the integral of ∫(√x^3 - 1/2√x + √2) dx.

The correct answer for question 5 is (2/5)x^(5/2) - (1/3)x^(3/2) + √2x + c.

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The p-value is between.01 and.025, not between less than.005 and.01 as shown in the answer options.

We can perform a chi-square goodness-of-fit analysis using a significance level of 0.05 to determine whether the audience's proportions altered following the schedule revision. The proportions staying the same under the null hypothesis, while at least one proportion changing under the alternative hypothesis.

With the use of the above information, we can determine the predicted frequencies under the assumption of a null, which are, respectively, 87, 78, 69, and 66 over ABC, CBS, NBC, or independents. Then, using the following formula, we can determine the chi-square test statistic: Observed frequency minus predicted frequency equals two.Expected frequency = 2. With the numbers entered, we obtain an evaluation statistic of 10.87.

The chi-square test's critical value for three degrees of independence (4 categories minus one) with a level of significance for 0.05 is 7.815. We reject the idea of a null hypothesis and come to the conclusion that the viewers proportions have changed because the test statistic for 10.87 is higher than the crucial value of 7.815.

This test's p-value ranges from 0.01 to 0.025, showing high evidence that the null hypothesis is false. At the threshold of significance of 0.05, we can therefore reject the idea of a null and accept the alternative hypothesis. The data indicates that the proportions of Saturday night viewers have changed since the schedule alteration, and that change is statistically important.

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The critical numbers of the function f(x) = x⁴e^(-5x) are approximately 0.00, 0.79, 1.50, and 2.62.

To find the critical numbers of a function, we need to find the values of x where the derivative of the function is equal to zero or undefined. In this case, we can use the product rule and the chain rule to find the derivative of f(x):

[tex]f'(x) = (4x^3 - 20x^2)e^{(-5x)[/tex]

To find where f'(x) = 0 or is undefined, we set the numerator equal to zero and solve for x:

4x³ - 20x² = 0

4x²(x - 5) = 0

x = 0 or x = 5/1 = 5 (but this value is not in the domain of the function)

Thus, we have one critical number at x = 0. To determine the other critical numbers, we can use the first derivative test and observe that f'(x) is negative when x is less than 0 and positive when x is greater than 0.

Therefore, f(x) is decreasing on (-∞, 0) and increasing on (0, ∞). We can now look for the zeros of f'(x) in each of these intervals. Using a graphing calculator or numerical methods, we find that f'(x) = 0 at approximately x = 0.79, 1.50, and 2.62.

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The average wait time at both Gap and Old Navy is five minutes.

The average wait time at both stores is the same, meaning that customers can expect to wait approximately five minutes before being checked out. However, the standard deviation for the wait time at Gap is smaller than that of Old Navy, indicating that the wait times at Gap are more consistent or predictable.

In contrast, the larger standard deviation at Old Navy suggests that customers may experience more variable wait times, with some waiting much longer than five minutes.

It would be interesting to further investigate why there is such a difference in the standard deviation between the two stores and how this might impact customer satisfaction and sales.

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The flux of F across the surface S in the outward direction using divergence theorem is 6.5.

By the divergence theorem, we have:

∫∫S F · dS = ∭E ∇ · F dV

where E is the solid region enclosed by S, and ∇ · F is the divergence of the vector field F.

We can compute the divergence of F as follows:

∇ · F = (∂/∂x)(x + sin(y)) + (∂/∂y)(xz + y) + (∂/∂z)(cos(xy) + 2z)

= 1 + z - sin(y) + x

Substituting this into the formula for flux, we have:

∫∫S F · dS = ∭E (1 + z - sin(y) + x) dV

Since the volume of E is 5, we have:

∫∫S F · dS = ∭E (1 + z - sin(y) + x) dV = 5(1 + 0.5 - 0 + 0.5) = 6.5

Therefore, the flux of F across the surface S in the outward direction is 6.5.

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The eigenvalue for this coefficient matrix is c, the eigenvector is (1, 0) and the generalized eigenvector is (1, -4).The most general real-valued solution to the linear system of differential equations is given by:y(x) = c1e^(-4x) + c2xe^(-4x),

To find the eigenvalue, we need to solve the characteristic equation of the coefficient matrix, which is given by det(A - cI) = 0. In this case, the characteristic equation is -c^2 + 4c = 0, which has a single solution of c = 4. Thus, the eigenvalue is c = 4.

To find the eigenvector, we need to solve the linear system (A - cI)v = 0. For this coefficient matrix, the linear system is (A - 4I)v = 0, which has the solution v = (1, 0). Thus, the eigenvector is (1, 0).

To find the generalized eigenvector, we need to solve the linear system (A - cI)w = v, where v is the eigenvector. In this case, the linear system is (A - 4I)w = (1, 0), which has the solution w = (1, -4). Thus, the generalized eigenvector is (1, -4).

Finally, the most general real-valued solution to the linear system of differential equations is given by y(x) = c1e^(-4x) + c2xe^(-4x), where c1 and c2 are arbitrary constants.

Characteristic equation: det(A - cI) = 0

-c2 + 4c = 0

c = 4

Eigenvector: (A - 4I)v = 0

v = (1, 0)

Generalized eigenvector: (A - 4I)w = v

w = (1, -4)

Most general solution: y(x) = c1e^(-4x) + c2xe^(-4x), where c1 and c2 are arbitrary constants.

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complete question

consider the initial value problem find the eigenvalue , an eigenvector , and a generalized eigenvector for the coefficient matrix of this linear system. -4 , 1 0 , c 0 find the most general real-valued solution to the linear system of differential equations. use as the independent variable in your answers.

The expected value of a continuous random variable is a measure of its central tendency or average value, while the variance is a measure of its variability or spread around the mean.

The expected value or mean of a continuous random variable X is defined as:

E[X] = ∫ xf(x) dx

where f(x) is the probability density function (pdf) of X, and the integral is taken over all possible values of X.

The variance of a continuous random variable X is defined as:

Var(X) = E[(X - μ)²]

where μ is the mean of X (i.e., E[X]), and the expectation is taken over all possible values of X. Alternatively, the variance can also be calculated as:

Var(X) = ∫ (x - μ)² f(x) dx

where f(x) is the probability density function (pdf) of X, and the integral is taken over all possible values of X.

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The statement, "number of customers entering a store between "9am" and noon, is an example of a discrete-random-variable." is True because the number of customers are finite.

The "random-variable" "number of customers entering the store between 9am and noon" is considered as an example of a discrete random variable.

A "discrete" random variable is defined as a variable that can take on only a finite or countable number of values, where the values are usually integers.

In this case, the number of customers entering a store can only take on integer values (0, 1, 2, 3, etc.), and there is a finite limit to the number of customers who could potentially enter the store during that time period.

Therefore, the statement is True.

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The coordinates of the image of the point (-4, 3) after a rotation of 90 degrees counterclockwise around the origin followed by a translation of 1 unit down and 1 unit left are (-4, -5).

To find the coordinates of the image of the point (-4, 3) after a rotation of 90 degrees counterclockwise around the origin followed by a translation of 1 unit down and 1 unit left, we can perform the two transformations one after the other and apply them to the point.

Rotation of 90 degrees counterclockwise around the origin changes the coordinates of a point (x, y) to (-y, x). Therefore, the image of (-4, 3) after the rotation is:

(-3, -4)

After the rotation, the point is translated 1 unit down and 1 unit left. This means that we subtract 1 from the y-coordinate and from the x-coordinate. Therefore, the final image of the point is:

(-3 - 1, -4 - 1) = (-4, -5)

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To construct a confidence interval for u, we need to ensure that the sample is representative of the population, the sample size is large enough, and the data is normally distributed or the sample size is greater than or equal to 30. In this case, the researcher gathered data from a random sample of 40 public, two-year colleges out of a total of 987 colleges in the US, which indicates a representative sample. Additionally, the sample size is greater than or equal to 30, so the conditions are met. However, we don't have information on the normality of the data, so we can assume normality given the large sample size. With a standard deviation of $1505, we can be confident that the confidence interval will have a narrow range and be relatively accurate.

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The probability that a certain tire of this brand will last between 56,010 miles and 56,580 miles is approximately 0.0811 or 8.11%.

To find the probability that a certain tire of this brand will last between 56,010 miles and 56,580 miles, we need to calculate the z-scores for both values and use the standard normal distribution.

First, we calculate the z-score for 56,010 miles:
z = (56010 - 60000) / 1900 = -2.11

Next, we calculate the z-score for 56,580 miles:
z = (56580 - 60000) / 1900 = -1.79

Now, we use a standard normal distribution table or calculator to find the area under the curve between these two z-scores:

P(-2.11 < Z < -1.79) = 0.0811

Therefore, the probability that a certain tire of this brand will last between 56,010 miles and 56,580 miles is approximately 0.0811 or 8.11%.

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Answer:

  D.  $420

Step-by-step explanation:

You want to know the amount that is 15% of $2800.

To find the amount that is 15% of $2800, multiply 15% by $2800.

  0.15 × $2800 = $420

Olive will save $420 each month, choice D.

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Additional comment

"%" is equivalent to "/100", so 15% = 15/100 = 0.15.

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The sample mean ô is an unbiased estimator for the population mean in this case.

Based on the provided information, we are working with a random sample X1, X2, ..., Xn from a population distributed according to a discrete mass function f(x). The population mean n, E(X), is given as 1. Now, let's consider an estimator for the population mean n, denoted as ô.
We can use the sample mean as a common and unbiased estimator to find an estimator for the population mean. The sample mean is calculated as the sum of the observed values divided by the number of observations:

ô = (X1 + X2 + ... + Xn) / n

The sample mean n ô is an unbiased estimator of the population mean, E(X, since its expected value is equal to the true population mean:

E(ô) = E[(X1 + X2 + ... + Xn) / n] = (E(X1) + E(X2) + ... + E(Xn)) / n

Given that E(X) = 1, we have:

E(ô) = (1 + 1 + ... + 1) / n = n / n = 1

Thus, the sample mean ô is an unbiased estimator for the population mean in this case.

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The evaluated probability that the selected person attends religious services more than once in a month is 47%, under the condition 4,491 respondents how often they attended religious services.

Then probability that a randomly selected respondent attended religious services more than once a month is found by summation of  total number of respondents who attended religious services month and  finally dividing it by the total number of respondents.

Therefore, the number of respondents who joined religious services more than once a month is
308 + 380 + 240 + 839 + 329
= 2096
The total number of respondents is 4491.

Then,  probability of  randomly selecting a respondent  who attends religious services more than once a month is
2096/4491
= 0.47
Converting it into percentage
0.47 × 100
= 47%
The evaluated probability that the selected person attends religious services more than once in a month is 47%, under the condition 4,491 respondents how often they attended religious services.

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