A group of students consists of four people in all; two women and two men. They agree to take turns taking notes in lecture. One person at a time will be selected at random from the group (without replacement) until everyone has had a turn. The expected value of the number of people selected before and including the first time a woman has a turn is (Q17)______ .
The standard error of the number of people selected before and including the first time a woman has a turn is (Q18)______ .

The determinant of the matrix b = -2a^4 is -648.

Given: det(a) = 3

To find: det(b) = det(-2a^4)

Solution:

We know that det(kA) = k^n * det(A) where A is a square matrix of order n.

So, det(-2a^4) = (-2)^3 * det(a^4)

Now, using the property det(AB) = det(A) * det(B), we can write:

det(a^4) = det(a) * det(a) * det(a) * det(a) = (det(a))^4 = 3^4 = 81

Therefore, det(-2a^4) = (-2)^3 * 81 = -648

Hence, the determinant of the matrix b = -2a^4 is -648.

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We can conclude that the regression coefficient for the first explanatory variable is significantly different from zero.

(a) The degrees of freedom for the F statistic for testing the null hypothesis that all five of the regression coefficients for the explanatory variables are zero are (5,60).
(b) The estimate of the standard deviation o of the model is the square root of the mean squared error (MSE), so in this case it is sqrt(36) = 6.
(c) To test the null hypothesis that the regression coefficient for the first explanatory variable is zero, we calculate the t-statistic as (coefficient - hypothesized value)/standard error, which in this case is (12.5 - 0)/2.4 = 5.21. The degree of freedom for the t-test is (60), and the corresponding p-value is very small, indicating strong evidence against the null hypothesis.

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The experiment involves measuring the distance traveled by different cars using 1 liter of gasoline, which represents a continuous random variable.

In this experiment, the variable being measured is the distance traveled by different cars using 1 liter of gasoline. A continuous random variable is a variable that can take any value within a certain range, often associated with measurements on a continuous scale. In this case, the distance traveled can take on any value within a range, such as from 0 to infinity. The distance is not limited to specific discrete values but can vary continuously based on factors like driving conditions, car efficiency, and individual driving habits.

Since the distance traveled is not limited to specific discrete values and can take on any value within a range, it is considered a continuous random variable. This means that measurements can be fractional or decimal values, allowing for a smooth and infinite number of possibilities. In statistical analysis, dealing with continuous random variables often involves techniques such as probability density functions and integration.

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The point that is one-fifth of the way from -9 to 17 on the number line is -3.8. (option a).

To find the point that is one-fifth of the way from -9 to 17 on the number line, we need to determine the distance between -9 and 17 and then divide it by 5.

First, let's calculate the distance between -9 and 17 on the number line. We do this by subtracting the smaller value (-9) from the larger value (17):

Distance = 17 - (-9)

= 17 + 9

= 26

So, the distance between -9 and 17 on the number line is 26 units.

Now, we need to find one-fifth of this distance. To do that, we divide the distance by 5:

One-fifth of the distance = 26 / 5

= 5.2

Therefore, one-fifth of the way from -9 to 17 is located at a point that is 5.2 units away from -9.

To determine the exact location on the number line, we add this distance to -9:

Location = -9 + 5.2

= -3.8

Therefore, the correct answer is option a. -3.8.

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The probability that the spinner lands on orange is P ( O ) = 1/4 = 25 %

We have,

The probability that an event will occur is measured by the ratio of favorable examples to the total number of situations possible

Probability = number of desirable outcomes / total number of possible outcomes

The value of probability lies between 0 and 1

Given data ,

The total number of sides for the spinner = 4

Since the spinner is divided into 4 equal sections, each section has an equal chance of being landed on

Therefore, the probability of spinning orange is 1 out of 4, or 1/4, which is equivalent to 25%

We can express this probability as:

P(orange) = 1/4

Hence , the probability that Josh spins orange is 1/4 or 25%

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The aspect of goal setting that Lisa is encountering is b. debt-to-income ratio.

A debt-to-income ratio is the percentage of a person's monthly income that the person uses for paying debts.

Lisa's goal of buying a house in six months is unrealistic because her income is too low to cover her expenses and save enough for a down payment.

This means that her debt-to-income ratio is not favorable for achieving her goal.

She would have to either increase her income or reduce her expenses, or shift the time frame she set for buying a house.

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We cannot make an estimate of the number of students who dislike cleaning their rooms as their least favorite chore.

The question provides no data regarding the number of students who dislike cleaning their rooms as their least favorite chore. Therefore, we cannot make a logical estimate. The number of students who dislike cleaning their rooms may be as few as zero, or it may be more than half of the total number of students.

The conclusion is that we cannot make an estimate of the number of students who dislike cleaning their rooms as their least favorite chore.

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(a) Using the property that (a^b)^c = a^(bc), we can simplify e^(-7/6) as e^((-7/6)(1/7)). Simplifying further, we have e^(-1/6) as the simplified expression.

(b) Using the property that a^b * a^c = a^(b+c), we can simplify e^4 * e^(-1/2) as e^(4 + (-1/2)). Simplifying further, we have e^(7/2) as the simplified expression.

(c) Using the property that a^(-b) = 1/(a^b), we can simplify e^(-4) * e^(-5) as (1/e^4) * (1/e^5). Using the property that a^b * a^c = a^(b+c), we can simplify further as 1/(e^(4+5)) = 1/e^9.

(d) Using the property that a^(-b) = 1/(a^b), we can simplify e^(-8) * e^(-3/2) as (1/e^8) * (1/e^(3/2)). Using the property that a^b * a^c = a^(b+c), we can simplify further as 1/(e^(8 + 3/2)) = 1/e^(19/2).

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the flux of the vector field through the square is 44.

To calculate the flux of the vector field vector f = (y, 11)vector j through a square of side 2 in the plane y = 10 oriented in the negative y direction, we can use the flux form of Gauss's law:

Φ = ∫∫S F · n dS

where S is the surface, F is the vector field, n is the unit normal vector to the surface, and dS is the differential surface area.

Since the surface is a square of side 2 in the plane y = 10, we can parameterize it as:

r(u, v) = (u, 10, v)

where 0 ≤ u,v ≤ 2.

The normal vector to the surface is given by:

n = (-∂r/∂u) × (-∂r/∂v)

= (-1, 0, 0) × (0, 0, 1)

= (0, 1, 0)

So, the flux becomes:

Φ = ∫∫S F · n dS

= ∫∫S (y, 11)vector j · (0, 1, 0) dS

= ∫∫S 11 dS (since y = 10 on the surface)

= 11 ∫∫S dS

Since the surface is a square of side 2, its area is 4. So, the flux is:

Φ = 11 ∫∫S dS = 11(4) = 44.

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Answer:

0.31 g

Explanation:

To find out how much pepper Haley has left, we need to subtract the amount she used from the amount she started with:

0.7 g - 0.39 g = 0.31 g

Therefore, Haley has 0.31 grams of pepper left.

If f is continuous and 4. 2∫ f(x) dx = 9, evaluate ∫ f (2x) dx will be 9/4.

Using the substitution u = 2x, we have:

∫ f(2x) dx = 1/2 ∫ f(u) du

Now, let's use the given information:

2∫ f(x) dx = 9

∫ f(x) dx = 9/2

Substituting this in our expression, we get:

∫ f(2x) dx = 1/2 ∫ f(u) du = 1/2 ∫ f(x) dx [using u = 2x]

= 1/2 × (9/2)

= 9/4

Therefore, the value of ∫ f(2x) dx is 9/4.

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To evaluate ∫ f(2x) dx, we can use the substitution u=2x, which means du/dx=2, or dx=du/2. Substituting this into the integral, we get: ∫ f(2x) dx = ∫ f(u) (du/2)

We can then rewrite the original equation as:

∫ f(x) dx = (9/2)

Substituting this into the integral we want to evaluate, we get:

2∫ f(x) dx = 2(9/2) = 9

Substituting this into our expression for ∫ f(2x) dx, we get:

∫ f(2x) dx = (1/2)∫ f(x) dx = (1/2)(9/2) = 9/4

Therefore, we have evaluated the integral ∫ f(2x) dx to be 9/4, using the given information that f is continuous and 2∫ f(x) dx = 9. To evaluate the integral ∫₀^2 f(2x) dx, first perform a substitution. Let u = 2x, so du = 2 dx. When x = 0, u = 0; when x = 2, u = 4. Now the integral becomes:

(1/2)∫₀^4 f(u) du.

We're multiplying by 1/2 because du = 2 dx, so dx = (1/2) du.

Since f is continuous and ∫₀^4 f(x) dx = 9, we can now evaluate the new integral:

(1/2) * 9 = 4.5.

So, ∫₀^2 f(2x) dx = 4.5.

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The correct choice is A. The polynomial has a real zero on the given interval because f(-4) and f(-3) are both negative. To apply the Intermediate Value Theorem, we need to show that the function changes sign between the endpoints of the interval.

Evaluating the function at the endpoints, we find that f(-4) = 117 and f(-3) = 48. Since both values are negative, the function changes sign at some point within the interval. Since f(-4) and f(-3) are both negative, we can conclude that the function must have a zero in the interval [-4, -3]. To approximate the zero, we can use numerical methods such as the bisection method or Newton's method. However, since you only asked for the correct choice and a summary, the exact value of the zero is not necessary for this question.

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Answer:

a

Step-by-step explanation:

Answer:

the answer would be the first one

Step-by-step explanation:

The equation of the curve is: y = x^2 + 3x - 2. The correct option is (D).

We can use the fact that the slope of the curve at each point (x,y) is given by 2x+3 to find the equation of the curve. We know that the curve passes through the point (1,2), so we can use this point to find the constant of integration in our equation.

Integrating the slope equation with respect to x, we get:

y = x^2 + 3x + C

To find the constant C, we plug in the coordinates of the point (1,2):

2 = 1^2 + 3(1) + C
C = -2

So the equation of the curve is:
y = x^2 + 3x - 2

Looking at the answer choices, we see that option D) matches this equation, so the answer is D).

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The probability of getting two "1's" out of three draws without replacement from the box is 0.3, which matches the first option.

To find the probability of getting two "1's" out of three draws without replacement from a box containing 5 tickets, we can use the following steps:

Step 1: Determine the total number of possible ways to draw three tickets from the box without replacement. This can be calculated using the formula for combinations:

C(5, 3) = 5! / (3! * 2!) = 10

Step 2: Determine the number of ways to draw two "1's" and one other ticket. There are two "1's" in the box, so we can choose two of them in C(2, 2) = 1 way. The third ticket can be any of the remaining three tickets in the box, so we can choose it in C(3, 1) = 3 ways. Thus, there are 1 x 3 = 3 ways to draw two "1's" and one other ticket.

Step 3: Calculate the probability of getting two "1's" by dividing the number of ways to draw two "1's" and one other ticket by the total number of possible draws:

P(two "1's") = 3 / 10

Therefore, the probability of getting two "1's" out of three draws without replacement from the box is 0.3, which matches the first option.

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To evaluate the line integral, we need to parameterize the curve, calculate ds, and then substitute the parameterization into the integral expression.

To evaluate the line integral ∫c xyz² ds, where c is the line segment from (-3, 5, 0) to (-1, 6, 4), we need to parameterize the curve and calculate the line integral using the parameterization.

Let's parameterize the curve c(t) from t = 0 to t = 1:

x(t) = -3 + 2t

y(t) = 5 + t

z(t) = 4t

Now, we need to calculate the derivative of each component with respect to t to find ds:

dx/dt = 2

dy/dt = 1

dz/dt = 4

ds = √((dx/dt)² + (dy/dt)² + (dz/dt)²) dt

= √(4 + 1 + 16) dt

= √(21) dt

Now, we can substitute the parameterization and ds into the line integral:

∫c xyz² ds = ∫[0,1] (x(t) * y(t) * z(t)²) * √(21) dt

= ∫[0,1] (-3 + 2t)(5 + t)(4t)² * √(21) dt

Now we can proceed to evaluate the line integral by plugging in the parameterization and limits of integration into the expression and calculating the integral.

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The sequence converges to 4.

We can begin by finding the limit of sin(4/n) as n approaches infinity. We know that as x approaches 0, sin(x)/x approaches 1. So we can rewrite sin(4/n)/4/n as (sin(4/n)/4/n) * (4/n)/1, which simplifies to sin(4/n)/4 * n.

Thus, as n approaches infinity, sin(4/n)/4 approaches 1, and the sequence {n sin (4/n)} approaches 4 * infinity, which is infinity. Therefore, the sequence diverges.

However, if we consider the modified sequence {sin(4/n)/(1/n)}, we can see that it is of the form 0/0, which is indeterminate. We can apply L'Hopital's rule to get lim n->infinity sin(4/n)/(1/n) = lim n->infinity (cos(4/n) * (-4/n^2)) = 0.

Therefore, by the squeeze theorem, we can conclude that {sin(4/n)/(1/n)} converges to 0, and {n sin(4/n)} approaches 4 * 0 = 0 as well.

Thus, the original sequence does not converge, but the modified sequence converges to 0.

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The equation that best supports the given scenario is 18x - 36 = 234, where 'x' represents the cost per banner.

Let's break down the information provided in the problem. Debra printed 18 banners and received a discount of $36 off her entire purchase. If we let 'x' represent the cost per banner, then the total cost of the banners before the discount would be 18x dollars.

Since she received a discount of $36, her total cost after the discount is 18x - 36 dollars.

According to the problem, Debra paid a total of $234 after the discount. Therefore, we can set up the equation as follows: 18x - 36 = 234. By solving this equation, we can determine the value of 'x,' which represents the cost per banner.

To solve the equation, we can begin by isolating the term with 'x.' Adding 36 to both sides of the equation gives us 18x = 270. Then, dividing both sides by 18 yields x = 15.

Therefore, the cost per banner is $15.

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The volume under the elliptic paraboloid and over the given rectangle is (3584/9) cubic units.

To find the volume under the elliptic paraboloid and over the given rectangle, we need to evaluate the double integral:

[tex]∬R 4x^2 + 7y^2 dA[/tex]

where R is the rectangle [−4,4]×[−1,1].

Using iterated integrals, we first integrate with respect to y and then with respect to x:

[tex]∫ from -4 to 4 [ ∫ from -1 to 1 (4x^2 + 7y^2) dy ] dx[/tex]

Integrating with respect to y, we get:

[tex]∫ from -4 to 4 [ (4x^2)y + (7/2)y^3 ][/tex]evaluated from -1 to 1 dx

Simplifying, we get:

[tex]∫ from -4 to 4 (56x^2/3) dx[/tex]

Integrating with respect to x, we get:

[tex](56/9) [ x^3 ] evaluated from -4 to 4[/tex]

= (56/9) [ 64 - (-64) ]

= (3584/9)

Therefore, the volume under the elliptic paraboloid and over the given rectangle is (3584/9) cubic units.

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Log (6) lies between 0 and 1 exclusive and it is a positive number since it is a logarithm of a number greater than 1.

The justification why log (6) must have a value less than 1 but greater than 0 is as follows:Justification:

The logarithmic function is a one-to-one and onto function, whose domain is all positive real numbers and the range is all real numbers, and for any positive real number b and a, if we have b > 1, then log b a > 0, and if we have 0 < b < 1, then log b a < 0.

For log (6), we can use a change of base formula to find that:log (6) = log(6) / log(10) = 0.7781, which is less than 1 but greater than 0, since 0 < log(6) / log(10) < 1, thus, log (6) must have a value less than 1 but greater than 0.

Therefore, log (6) lies between 0 and 1 exclusive and it is a positive number since it is a logarithm of a number greater than 1.

Thus, the justification of why log (6) must have a value less than 1 but greater than 0 is proven.

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A basis for the eigenspace corresponding to the eigenvalue λ = 4 is the set {[3; 2]}.

To find the eigenspace of the matrix A = [10 -9; 4 -2] corresponding to the eigenvalue λ = 4, we need to find the nullspace of the matrix A - λI, where I is the 2x2 identity matrix and λ is the eigenvalue:

A - λI = [10 -9; 4 -2] - 4[1 0; 0 1]

      = [6 -9; 4 -6]

To find the nullspace of this matrix, we need to solve the system of homogeneous linear equations:

6x - 9y = 0

4x - 6y = 0

We can simplify this system by dividing the first equation by 3, which gives:

2x - 3y = 0

4x - 6y = 0

We can see that the second equation is a multiple of the first equation, so we only need to solve one of the equations. We can choose the first equation and solve for x in terms of y:

2x = 3y

x = (3/2)y

So the eigenvector corresponding to the eigenvalue λ = 4 is a non-zero vector in the nullspace of A - λI, which in this case is the vector [3; 2] (or any non-zero scalar multiple of it).

Therefore, a basis for the eigenspace corresponding to the eigenvalue λ = 4 is the set {[3; 2]}.

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The customer was overcharged by $5.28.

A customer shows you their receipt and states they were overcharged.

The customer’s receipt shows a license fee of $36.00, registration fee of $12.00, and a local tax rate of 7%.

The customer was charged $56.64. How much money was the customer overcharged?

To find out the overcharged amount of money of the customer, we need to calculate the total cost as follows:

Total cost = License fee + Registration fee + (License fee + Registration fee) × Tax rate

                 = $36 + $12 + ($36 + $12) × 7% = $48 + $3.36= $51.36

The total cost of the fees plus tax was $51.36.

As we know, the customer was charged $56.64, so the customer was overcharged by $56.64 – $51.36 = $5.28.

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Stock B will cost $325.00 more than Stock A at the end of 4 years.

Given that Stock A doubles in price by the end of every year, while Stock B triples in price by the end of every year.

If they both start off at $5.00, we need to determine how much more will Stock B cost than Stock A at the end of 4 years. We need to determine how much more Stock B will cost than Stock A at the end of 4 years if they both start off at $5.00.

Solution: We can represent the price of Stock A and Stock B at the end of the 4th year as:

Price of Stock A = $5.00 × 2 × 2 × 2 × 2 = $80.00

Price of Stock B = $5.00 × 3 × 3 × 3 × 3 = $405.00

The difference in the price of Stock B and Stock A at the end of the 4th year is:

Price of Stock B - Price of Stock A = $405.00 - $80.00 = $325.00

Stock B will cost $325.00 more than Stock A at the end of 4 years.

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The expression of [tex]\frac{20z^{10} }{(5z^{-2}) ^{3} } \\\\\\[/tex] in  fraction in simplest form can be written as  [tex]\frac{4}{25} \ *z^{16}[/tex]

An element of a whole can be described as fraction however the number  can be expressed mathematically as a quotient, and the numerator and denominator  is been divided into two where Both are integers in a simple fraction , it should be noted that the proper fraction  will be less than the denominator.

Given that

[tex]\frac{20z^{10} }{(5z^{-2}) ^{3} } \\\\\\[/tex]

This can be simplified as

[tex]\frac{20z^{10} }{(5z^{-2}) ^{3} } \\\\\\\\\\[/tex]

[tex]\frac{20z^{10} }{(125*z^{-2}) ^{3}}[/tex]

= [tex]\frac{20z^{10}}{125 * z^{-6} }[/tex]

We can divide both up and the denominator by 5

= [tex]\frac{4z^{10}}{25 * z^{-6} }[/tex]

[tex]= \frac{4}{25} \ *z^{16}.[/tex]

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The given system of equation 2x + 4y = 1, 2x + 4y = 1  is an example of a dependent system of equations.

A dependent system of equations is a system of equations where there are an infinite number of solutions, and the equations share the same solution set.

We have to find the relationship between the given equations to determine whether the system is dependent or independent.In this case, both equations are identical.

2x + 4y = 1 is the same as 2x + 4y = 1.

The equations have the same coefficients and the same constant term, which implies that they are parallel lines and coincide with each other.

Thus, the given system of equation 2x + 4y = 1, 2x + 4y = 1

is an example of a dependent system of equations as they share the same solution set.

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1. The term used to describe an association or interdependence between two sets of data or variables is "Correlation Analysis."

Correlation Analysis is a statistical method used to determine the strength and direction of the relationship between two variables.

2. The graphic tool used to illustrate the relationship between two variables is called a "Scatter Diagram."

Explanation: A Scatter Diagram is a graphical representation of data points that shows the relationship between two variables, often using dots or other symbols to represent each observation.

3. The term represented by the symbol 'r' in correlation and regression analysis is "Pearson Correlation Coefficient."

The Pearson Correlation Coefficient measures the linear relationship between two variables, with values ranging from -1 to 1.

4. True statement: Correlation does not imply causation.

Understanding correlation analysis, scatter diagrams, and the Pearson Correlation Coefficient is crucial for interpreting relationships between variables in various fields, such as business, social sciences, and natural sciences.

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Decide whether the given integral converges or diverges. +[infinity] ∫ (7 / x^1.5 ) dx 1 b. diverges.

To determine if the given integral converges or diverges, we can use the p-test. This test states that if the integral of a function f(x) from a to infinity converges or diverges, then the integral of 1/(x^p) from a to infinity converges if p>1 and diverges if p<=1.

In this case, the integral is from 1 to infinity, and the function is 7/(x^1.5), which can be written as 7x^(-1.5). Using the p-test with p=1.5, we get:

∫(1 to infinity) 7/(x^1.5) dx = ∫(1 to infinity) 7x^(-1.5) dx

Since p=1.5>1, the integral converges if and only if the integral of 1/x^1.5 from 1 to infinity converges. However, this integral diverges because p<=1. Therefore, the original integral also diverges.

The given integral diverges.

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By applying the Laplace transform to the given boundary-value problem and following the procedure outlined in Example 10, the solution for y(t) is obtained as y(t) = 6e^(-t).

The Laplace transform can be used to solve differential equations, including boundary-value problems. In this case, we have the second-order linear homogeneous differential equation y'' + 2y' + y = 0, with the initial conditions y'(0) = 6 and y(1) = 6.

To solve the problem using the Laplace transform, we apply the transform to the differential equation and the initial conditions. This transforms the differential equation into an algebraic equation that can be solved for the Laplace transform of y(t), denoted as Y(s).

By applying the Laplace transform to the given differential equation, we obtain the algebraic equation s^2Y(s) + 2sY(s) + Y(s) = 0. Solving this equation for Y(s), we find Y(s) = 6s/(s^2 + 2s + 1).

To find the inverse Laplace transform of Y(s) and obtain the solution y(t), we use partial fraction decomposition and consult Laplace transform tables. By applying the inverse Laplace transform, we find y(t) = 6e^(-t).

Therefore, the solution for the given boundary-value problem is y(t) = 6e^(-t)

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The approximate length of the apothem is 20.1 cm.

The apothem of a polygon is the perpendicular distance from the center of the polygon to any of its sides. To determine the approximate length of the apothem, we need to consider the given options: 9.0 cm, 15.6 cm, 20.1 cm, and 25.5 cm.

Since we are asked to round to the nearest tenth, we can eliminate the options of 9.0 cm and 25.5 cm since they don't have tenths. Now, we compare the remaining options, 15.6 cm and 20.1 cm.

To determine the apothem's length, we can use the formula for the apothem of a regular polygon, which is given by:

apothem = side length / (2 * tan(π / number of sides))

By comparing the values, we see that 20.1 cm is closer to 15.6 cm than 20.1 cm is to 25.5 cm. Therefore, we can conclude that the approximate length of the apothem is 20.1 cm, rounding to the nearest tenth.

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The probability is D. 0.7807. Therefore, the answer is D. 0.7807.

To calculate the power of the test, we need to determine the probability of rejecting the null hypothesis when the alternative hypothesis is true. In other words, we want to find P(reject H0 | Ha is true).

First, we need to calculate the critical value that corresponds to the level of significance of the test. Since the alternative hypothesis is one-tailed (Ha:μ>100), and the level of significance is not given, we'll assume a significance level of 0.05 (commonly used in hypothesis testing).

Using a standard normal distribution table or calculator, we find that the critical value for a one-tailed test at a 0.05 level of significance is 1.645.

Next, we need to calculate the standard error of the mean (SEM), which is equal to the population standard deviation divided by the square root of the sample size.

SEM = 8 / √60 = 1.0328

To find the test statistic (z-score) for the alternative hypothesis, we use the following formula:

z = (x¯ - μ) / SEM

z = (101.7 - 102.5) / 1.0328 = -0.775

The area to the right of this z-score under the standard normal distribution represents the probability of rejecting the null hypothesis when the alternative hypothesis is true.

Using a standard normal distribution table or calculator, we find this probability to be:

P(z > -0.775) = 0.7807

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The probability is D. 0.7807. Therefore, the answer is D. 0.7807.

Using a standard normal distribution table or calculator, we find that the critical value for a one-tailed test at a 0.05 level of significance is 1.645.

Next, we need to calculate the standard error of the mean (SEM), which is equal to the population standard deviation divided by the square root of the sample size.

= 8 / √60 = 1.0328

To find the test statistic (z-score) for the alternative hypothesis, we use the following formula:

z = (x - μ) / SEM

z = (101.7 - 102.5) / 1.0328 = -0.775

Using a standard normal distribution table or calculator, we find this probability to be:

P(z > -0.775) = 0.7807

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