The first shelf on Hannah’s bookshelf hoods an equal number of fiction and nonfiction. If Hannah’s selects 5 books randomly, what is the probability that 3 of the books will be fiction and 2 will be nonfiction

The solutions are,

a) the statistical procedure you should use to answer this question is  normal approximation.

b) p = 0.1034 is the probability of correctly predicting exactly 20 cards in a series of 100 trials.

c) 0.1238 is the probability of correctly predicting more than 16 cards in a series of 64 trials.

Here, we have,

a)

X - the number of success

following the binomial distribution with p = 1/5

or when np > 5 ,nq > 5

we can use normal approximation

mean = np

sd =sqrt(npq)

b)

here n = 100

P(X = k) = 100Ck * (1/5)^k *(1-1/5)^(100-k)

P(X = 20) = 100C20 (1/5)^20* (4/5)^80

by normal approximation

μ = 20 and σ = 4 For X = 20,

P(19.5 < X< 20.5)

P ( −0.13<Z<0.13 )=0.1034

and p = 0.1034.

c)

P(X > 16)

mean = np = 64/5 = 12.8

sd = sqrt(npq) = sqrt(12.8*.8)= 3.2

P(X > 16)

=P(Z > (16.5 - 12.8)/3.2)

= P(Z> 1.1562)

= 0.1238

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This question is incomplete, here is the complete question:

A test developed to measure ESP involves using Zener cards. Each card shows one of five equally likely symbols (square, circle, star, cross, wavy lines) and the person being tested has to predict the shape on each card before it is selected. Answer questions a-c below to find each of the probabilities requested for a person who has no ESP and is just guessing. a. Determine the statistical procedure you should use to answer this question and explain why. b. What is the probability of correctly predicting exactly 20 cards in a series of 100 trials? c. What is the probability of correctly predicting more than 16 cards in a series of 64 trials?

The sum of money is approximately Rs. 6250.

Given that the difference is Rs. 40, we must calculate the difference between compound interest and simple interest over a period of two years at an annual rate of 8%.

Assume that P represents the principal amount of money.

The formula for simple interest is: SI = (P * R * T) / 100

The formula for compound interest is: [tex]CI = P * (1 + R/100)^T^ - ^P[/tex]

Where

The difference between compound interest and simple interest is Rs. 40. Therefore:

CI - SI = Rs. 40

Substituting the formulas and values into the equation:

[tex](P * (1 + 8/100)^2 - P) - (P * 8 * 2 / 100) = 40[/tex]

Simplifying further:

[tex](P * (1.08^2) - P) - (0.16P) = 40[/tex]

[tex](P * 1.1664 - P) - 0.16P = 40[/tex]

[tex]1.1664P - P - 0.16P = 40[/tex]

[tex]0.0064P = 40[/tex]

[tex]P = 40 / 0.0064[/tex]

[tex]P[/tex] ≈ [tex]6250[/tex]

Therefore, the sum of money is approximately Rs. 6250.

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The measure of the diagonal of given rectangular bulletin board is 6x+0.3 meters.

Given that, MN=4x-0.1 meters and NK=2x+0.4 meters.

Here, diagonal = MK=MN+NK

= 4x-0.1+2x+0.4

= 6x+0.3

Therefore, the measure of the diagonal of given rectangular bulletin board is 6x+0.3 meters.

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The length of PN in the circle is 4√2 units.

The length of GN in the circle is 8 units and length of KP in the circle is 4.

Therefore, let's find the length PN in the circle as follows:

PM is perpendicular to the chord GH. Therefore, the length KH is equals to the length GK.

Hence,

GH = 8 units

GK = 4 units

KH = 4 units

Therefore,

MP is the radius of the circle just like PN.

PN = MP

Hence, using Pythagoras's theorem,

4² + 4² = PN²

PN = √16 + 16

PN = √32

PN = 4√2 units

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The solutions to the circle equations in the attached figure are: (5) (x + 2)² + (y - 1)² = 20, (6) x² + y² = 9, (7) (x + 3)² + (y - 1)² = -9 and (8) (x - 4)² + (y - 3)² = -16

Equation of a Circle in the Cartesian coordinate system (x, y) is given by:

(x - h)² + (y - k)² = r²

where

(h, k) = coordinates of the center of the circle

r = radius.

The expression (x - h)² + (y - k)² represents the squared distance between any point (x, y) on the circle and the center point (h, k). By setting this expression equal to the square of the radius, r², we ensure that all points on the circle are equidistant from the center.

You can also expand the equation to get the standard form:

x² - 2hx + h² + y² - 2ky + k² = r².

Using the information above, let us solve the circle equations:

5) y² + 4x - 20 - 2y = -x²

First we need to find the coordinates (h, k) of the circle

x² + 4x + y² - 2y = 20

-2h = 4 => h = -2

-2k = -2 => k = 1

(h,k) = (-2, 1)

Rewrite the equation in a standard circle format

Recall: (x - h)² + (y - k)² = r²

(x - (-2))² + (y - (1))² = 20

(x + 2)² + (y - 1)² = 20

Therefore the solution to the circle equation is: (x + 2)² + (y - 1)² = 20 and the curve is attached.

6) -9 = -y² - x²

First we need to find the coordinates (h, k) of the circle

x² + y² = 9

-2h = 0 => h = 0

-2k = 0 => k = 0

(h, k) = (0, 0)

Rewrite the equation in a standard circle format

Recall: (x - h)² + (y - k)² = r²

(x - (0))² + (y - (0))² = 9

x² + y² = 9

Therefore the solution to the circle equation is: x² + y² = 9 and the curve is attached.

7) 9 = 2y - y² - 6x - x²

First we need to find the coordinates (h, k) of the circle

x² + 6x + y² - 2y = -9

-2h = 6 => h = -3

-2k = -2 => k = 1

(h, k) = (-3, 1)

Rewrite the equation in a standard circle format

Recall: (x - h)² + (y - k)² = r²

(x - (-3))² + (y - (1))² = -9

(x + 3)² + (y - 1)² = -9

Therefore the solution to the circle equation is: (x + 3)² + (y - 1)² = -9 and the curve is attached

8) 16 + x² + y² - 8x - 6y = 0

First we need to find the coordinates (h, k) of the circle

x² - 8x + y² - 6y = -16

-2h = -8 => h = 4

-2k = -6 => k = 3

(h,k) = (4, 3)

Rewrite the equation in a standard circle format

Recall: (x - h)² + (y - k)² = r²

(x - (4))² + (y - (3))² = -16

(x - 4)² + (y - 3)² = -16

Therefore the solution to the circle equation is: (x - 4)² + (y - 3)² = -16 and the curve is attached.

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The experimental probability that the next train to pull into Lakeside Station will be full is 7/10.

The experimental probability of the next train to pull into Lakeside Station being full can be calculated by dividing the number of times a full train occurred by the total number of trains observed.

Given that out of the last 20 trains, 14 were full, we can express the experimental probability as a fraction:

P(full) = Number of full trains / Total number of trains observed

P(full) = 14 / 20

Simplifying the fraction, we get:

P(full) = 7 / 10

Therefore, the experimental probability that the next train to pull into Lakeside Station will be full is 7/10.

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The words that has to be kept in the blank space to prove the similarity are (a, 0), (0, a) and scale factor.

Here we have to choose the words to finish the explanation of how to plan a coordinate proof to show that all isosceles right triangles are similar.

Isosceles right triangles are the right triangles which has the two legs of same length.

For that first consider an isosceles right triangle with legs having length "a".

Then if we place the triangle with one of the vertices at origin, then since the length of the legs is "a", the other vertices will be at (a, 0) and (0, a).

If we place another triangle similarly with length of legs "b", then we have to prove that they are similar.

For them to be similar, there must exist a scale factor that maps one triangle on to the other.

Hence the spaces are (a, 0), (0, a) and scale factor.

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Applying Pythagoras theorem and trigonometry In the figure the length of x is

Using Pythagoras theorem given by the  the formula

hypotenuse² = opposite² + adjacent²

plugging the values as in the problem

let y be the required distance

y² = 10² + 15²

y² = 325

y = √18.03

y = 5√13

y = 18.03

To solve for x we use trigonometry tan

tan 45 = 5√3 / x

x = 5√13 / tan 45

x = 5√13

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Answer:

To find the sum of (-2.1x + 3.7) and (5 + 4.9x), we need to add the like terms (terms with the same variable and exponent). In this case, the x term is the like term. Therefore:

(-2.1x + 3.7) + (5 + 4.9x) = -2.1x + 4.9x + 3.7 + 5

Combining like terms, we get:

(-2.1x + 4.9x) + (3.7 + 5) = 2.8x + 8.7

Therefore, the sum of (-2.1x + 3.7) and (5 + 4.9x) is 2.8x + 8.7.

So, the answer is: 2.8x+8.7.

Step-by-step explanation:

Solution 2:

The correct answer is 2.8x+8.7.

Here's the solution:

(-2.1x +3.7) + (5 + 4.9x) =

-2.1x + 3.7 + 5 + 4.9x =

-2.1x + 4.9x + 3.7 + 5 =

2.8x + 8.7: answer

As per the given data, Focus: (0, 16.44), Directrix: y = -16.44, Focal Diameter: 32.88, Vertex: (0, 0), and Axis of Symmetry: x = 0 (y-axis).

To determine the focus, directrix, focal diameter, vertex, and axis of symmetry for the given parabola equation, we can rewrite it in standard form, which is of the form [tex](x - h)^2[/tex] = 4p(y - k), where (h, k) represents the vertex.

16.44y = x²

Divide both sides of the equation by 16.44 to isolate y:

y = (1/16.44)x²

Comparing this equation to the standard form, we can see that h = 0 and k = 0.

Therefore, the vertex is (h, k) = (0, 0).

The general equation for a parabola in standard form is given by (x - h)^2 = 4p(y - k), where p is the distance between the vertex and the focus (or the vertex and the directrix). In this case, p can be found using the coefficient of y in the equation (1/4p = 1/16.44).

Thus, p = 16.44.

The focus is located at a distance of p units above the vertex, so the focus is (0, p) = (0, 16.44).

The directrix is located at a distance of p units below the vertex, so the directrix is the horizontal line y = -p, which gives us y = -16.44.

The focal diameter is twice the value of p, so the focal diameter is 2p = 2 * 16.44 = 32.88.

Therefore:

- The focus is (0, 16.44).

- The directrix is y = -16.44.

- The focal diameter is 32.88.

- The vertex is (0, 0).

- The axis of symmetry is the vertical line passing through the vertex, which is the y-axis (x = 0).

Thus, Focus: (0, 16.44), Directrix: y = -16.44, Focal Diameter: 32.88, Vertex: (0, 0), and Axis of Symmetry: x = 0 (y-axis).

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The surface area of the box increases by 27.4 cm² when the height is increased by 0.2 cm.

To find the increase in surface area, we first need to calculate the initial surface area of the box and then calculate the surface area after increasing the height.

The formula for the surface area of a rectangular prism is given by:

Surface Area = 2*(length width + length height + width*height)

Initial Surface Area:

Length (L) = 13 cm

Width (W) = 8.7 cm

Height (H) = 28 cm

Initial Surface Area = 2*(138.7 + 1328 + 8.7*28)

Next, we calculate the new surface area after increasing the height by 0.2 cm. The new height is:

New Height = Initial Height + Increase in Height = 28 cm + 0.2 cm

New Surface Area = 2*(138.7 + 13(28+0.2) + 8.7*(28+0.2))

To find the increase in surface area, we subtract the initial surface area from the new surface area:

Increase in Surface Area = New Surface Area - Initial Surface Area

Let's calculate the values:

Initial Surface Area = 2*(138.7 + 1328 + 8.728) = 2(113.1 + 364 + 243.6) = 2*(720.7) = 1441.4 cm²

New Surface Area = 2*(138.7 + 13(28+0.2) + 8.7*(28+0.2)) = 2*(113.1 + 377.2 + 244.1) = 2*(734.4) = 1468.8 cm²

Increase in Surface Area = New Surface Area - Initial Surface Area = 1468.8 cm² - 1441.4 cm² = 27.4 cm²

Therefore, the surface area of the box increases by 27.4 cm² when the height is increased by 0.2 cm.

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Answer:

Step-by-step explanation:

[tex]1c-0.25c=0.75c[/tex]

Answer:

Step-by-step explanation:

The value of x is 1/3 and y is -5/3. using substitution method.

We have,

A linear equation has one or two variables.

No variable in a linear equation is raised to a power greater than 1.

No variable is used as the denominator of a fraction.

A linear equation is defined as an equation that is written in the form of ax+by=c.

When solving the system of linear equations, we will get the values of the variable, which is called the solution of a linear equation.

solving this we will get the valve of Y if x is given.

CALCULATION:-

Y=x-2 -----(1)

y=-2x+7 ---------(2)

putting the value of y in the equation (2)

x-2= -2x+7

x+2x=7+2

3x=9

x=9/3

x=1/9

putting the value of X in equation(1)

Y=x-2 -----(1)

y=1/3-2

y=-5/6  

Hence, The value of x is 1/3 and y is -5/3. using substitution method.

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complete question:

Use the substitution method to solve the system of equations write your answer as an ordered pair Y=x-2 and y=-2x+7

Five monuments around the world where Roman numerals are used to depict the year in which they were built are indicated below.

We have,

the Roman Monuments and the dates they were built:

The roman monuments and the dates they were built are:

Roman Theatre of Merida - 16BC

The White Marble Arch of Septimius Severus - 203 AD

The Pantheon - 125 AD

The colosseum - 70 AD

the Mausoleum of Helena - 28 BC

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Answer:

certain

Step-by-step explanation:

The question says "strawberry OR cherry chew", which means if you have only 17 strawberry and 3 cherry chews, the answer is certain, as you will always pull out one of those options.

The answer to the equation 9s + 13 = 10s + 12

We must place the variable s on one side of the equation in order to solve the equation 9s + 13 = 10s + 12. Here's how to accomplish it:

9s + 13 = 10s + 12

First, by taking 9s away from both sides of the equation, let's move all the terms containing s to one side:

9s - 9s + 13 = 10s - 9s + 12

That amounts to:

13 = s + 12

Next, take 12 off of both sides to isolate the variable s:

13 - 12 = s + 12 - 12

1 = s

As a result, s = 1 is the answer to the equation 9s + 13 = 10s + 12

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The only one that can possibly cause lower your credit score is "You apply for a student loan and the lender requests a copy of your credit report."

The lender normally does a hard inquiry on your credit record when you apply for a new loan or line of credit.

Your credit score may be slightly lowered as a result of this hard inquiry, typically by a few points.

However, the effect is often short-lived, and your credit score should gradually improve.

Hence the correct option is You apply for a student loan and the lender requests a copy of your credit report.

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The algebraic expression representing 6 added to x is given as follows:

x + 6.

The sentence in the context of this problem is given as follows:

"If x is a number, the number added do 6 is given by".

The number is given as follows:

x.

The addition by 6 means that the number 6 is added to the variable x, as follows:

x + 6.

Which is the algebraic expression.

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Step-by-step explanation:

To find the perimeter, we add all side lengths.

Two of the side lengths are given, to find the third side length, we use the following equation based on similarity ratio:

[tex] \frac{kj}{nm} = \frac{kl}{no} [/tex]

[tex] \frac{8}{18.4} = \frac{9}{no} [/tex]

8NO = 165.6

NO = 20.7

20.7 + 23 + 18.4 = 62.1 square units.

Answer: the present age of son is 15 years, and the present age of father is 45 years.

Step-by-step explanation:

Let the age of son be 'x' and that of his father be 'y'.

So according to the question, the 1st equation that can be formed will be:

y = 3(x) ->(1)

[as father's age is 3 times the age of son]

Now after 5 years:

Age of son = (x+5)

Age of father = (y+5)

So according to the question, the 2nd equation that can be formed will be:

(y+5) = 2.5×(x+5) ->(2)

[as father is now two and half times old as his son]

Substituting the value of equation (1) in (2), we get:

(3x+5) = 2.5×(x+5)

=> 3x + 5 = 2.5x + 12.5

=> 3x - 2.5x = 12.5 - 5

=> 0.5x = 7.5

=> x = 7.5/0.5 = 15

Thus, the present age of son is 15 years.

Note : we can calculate the age of father by putting the value of x in equation (1) or (2):

y = 3(x) = 3 × 15 = 45 (putting x in equation 1)

Thus, the present age of father is 45 years.

Answer:

x = 93

Step-by-step explanation:

the adjacent angle to x ( on the right side) and 48° are alternate angles and are congruent.

the 3 angles lying on line m sum to 180° , that is

39 + x + 48 = 180

x + 87 = 180 ( subtract 87 from both sides )

x = 93

The value of slope of line is,

⇒ m = - 1

We have to given that,

Two points on the line are (- 4, 5) and (- 7, 8).

Now, We know that,

Slope of the line passing through the points (x₁ , y₁) and (x₂, y₂) is,

m = (y₂ - y₁) / (x₂ - x₁)

Here, Two points on the line are (- 4, 5) and (- 7, 8).

Hence, Slope is,

m = (8 - 5) / (- 7 + 4)

m = 3 / - 3

m = - 1

Therefore, The value of slope of line is,

⇒ m = - 1

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Answer:

Pretty sure the answer is A

Step-by-step explanation:

The length of the arcs are;

1. s = 6. 4π

2. s = 11. 0π

The formula for calculating the length of an arc is expressed as;

s = rθ

Such that;

From the information given, we have that;

s = 4.25 × 3π/2

Multiply the values, we get

s = 12.75π/2

Divide by the coefficient , we get;

s = 6. 4π

2. The length of the arc would be;

s = 6.62 × 5π/3

Multiply the values, we have;

s = 33. 1π/3

Divide by the value, we get;

s = 11. 0π

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The net decrease in calories after walking for 5 hours will be 50 calories.

we have given that the 25-year old woman burns 300-60tcal/hr and Her caloric intake from drinking Gatorade is 110t calories during the t hour.

And we have to find the net decrease in calories after walking for 5 hours.

So, For this purpose,

We know that the

calories burns in one hour = 300-60tt

calories burns in 5 hours = 5(300-60t)

calories burns in 5 hours = 1500- 300t

Now,

Calorie intake in t hours = 110t

And net decrease in calories after walking for 5 hours =  1500- 300t + 140t

the net decrease is 50 cal.

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Nina's average cost per day for these four services is $5.

Since, Nina's monthly cost for the cable TV services is $99, and her monthly cost for cell phone calls and text messages is $59.70.

So her total monthly cost is:

$99 + $59.70 = $158.70

Now we need to find the number of days in a month.

Since, There are different ways to do this, but if we assume a month has 30 days,

= $158.70 / 30

= $5.29 (rounded to the nearest cent)

Therefore, Nina's average cost per day for these four services is $5.29. Rounded to the nearest dollar, her average cost per day is $5.

So, Nina's average cost per day for these four services is $5.

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The area of the escribed circle is: 201.06 cm²

The formula for the area of a circle is:

A = πr²

where:

A is area

r is radius

From the given diagram, we see that, the side length of the square is 16 cm. Now, we also see that the side length of the square serves as the diameter of the circle and as such:

Radius of circle: r = 16/2 = 8 cm

Thus:

A = π(8²)

A = 201.06 cm²

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Answer:

sec B = [tex]\frac{15}{8}[/tex]

Step-by-step explanation:

using the identity

sec B = [tex]\frac{1}{cosB}[/tex]

cos B = [tex]\frac{adjacent}{hypotenuse}[/tex] = [tex]\frac{BC}{CD}[/tex] = [tex]\frac{8}{15}[/tex]

then

sec B = [tex]\frac{1}{\frac{8}{15} }[/tex] = [tex]\frac{15}{8}[/tex]

Answer: (x+3)(x-4)

Step-by-step explanation: