Carl has $500 in an account. Every 30 days, he withdraws $100. The amount of money remaining in his account is a function of the amount of time that has passed.


Which function models the amount of money remaining in Carl's account?

The answer is that the resulting function is called a composite function.

A composite function is formed by combining two or more functions, where the output of one function becomes the input of another. In this case, when two functions are combined so that the range of one becomes the domain of the other, the resulting function is a composite function.

This can be given by considering two functions f(x) and g(x). If we want to create a composite function, we need to use the output of one function as the input for the other. So, if we let g(x) be the first function, then the output of g(x) becomes the input for f(x). This can be written as f(g(x)).

Now, if we want the range of g(x) to become the domain of f(x), we need to make sure that the output of g(x) is a valid input for f(x). In other words, the range of g(x) should be a subset of the domain of f(x).

For example, let's say g(x) = x² and f(x) =√(x). The domain of g(x) is all real numbers, and its range is all non-negative real numbers. The domain of f(x) is also all non-negative real numbers. So, we can create a composite function f(g(x)) by using the output of g(x) (which is always non-negative) as the input for f(x).

To know more about domain  visit:

brainly.com/question/30133157

#SPJ11

To find the margin of error for a 95% confidence interval using the t-distribution, we first need to calculate the t-score with degrees of freedom (df) equal to the sample size minus 1 (n-1).

In this case, df = 9. Using a t-table or calculator, the t-score for a 95% confidence level and df = 9 is approximately 2.262. The margin of error can be calculated by multiplying the t-score by the standard error of the mean, which is equal to the standard deviation divided by the square root of the sample size.

In this case, the standard error of the mean is 206 / sqrt(10) = 65.20. Multiplying by the t-score, we get a margin of error of 2.262 * 65.20 = 147.54. To construct the 95% confidence interval, we can use the formula:
sample mean +/- (t-score * standard error of the mean)

Substituting in the values, we get:
$450.50 +/- (2.262 * $65.20) = $450.50 +/- $147.54

So, the 95% confidence interval for the population mean mu is $302.96 to $598.04.

Interpreting the results, we can say with 95% confidence that the true population mean full retail price of cell phones is between $302.96 and $598.04. The margin of error is the amount by which the sample mean may differ from the true population mean, and in this case it is +/- $147.54.


The 95% confidence interval for the population mean (µ) is ($304.1, $596.9), and the margin of error is $146.4. This means we can be 95% confident that the true population mean price of cell phones is between $304.1 and $596.9.

To know more about population click here

brainly.com/question/31544819

#SPJ11

The true statements in the rectangle DEFG are FHE = 60 and FEH = 60

From the question, we have the following parameters that can be used in our computation:

The rectangle DEFG

On the rectangle DEFG, we have

1.5x + 8 = 3x + 2

Evaluate the like terms

So, we have

1.5x = 6

This gives

x = 4

Also, we have the following angle measures

FHE = 180 - 120

FHE = 60

Then, we have

FEH = FHE = 60

Hence, the the true statements in the rectangle DEFG are FHE = 60 and FEH = 60

Read more about rectangles at

brainly.com/question/25292087

#SPJ1

Answer:

there're many ways to solve it, I don't know what the teacher is looking for, but I think the answer could be

1x^3=1

but I'm not sure about it

The minimum radius of convergence R of power series solutions about the ordinary point x = 0 is 4.123 and that about the ordinary point x = 1 is 4 units.

What is radius of convergence?

In mathematics, the radius of convergence of a power series is  stated as the radius of the largest disk at the center of the series in that the series converges. Radius of convergence is either a non-negative real number or infinity.

The given differential equation is

(x² -2x+17) y" +xy' -4y =0

We have to find the minimum radius of convergence R of power series solutions about the ordinary point x = 0 and x = 1.

The minimum radius of convergence can be defined as the distance between the ordinary point and the singularity of the differential equation.

Singularity point is the root of the polynomial attached with the second derivative. So, the singularity points can be calculated as,

(x² -2x+17)=0 Comparing this with ax²+bx+c=0 we get,

x=[tex]\frac{-b+\sqrt{b^{2} -4ac } }{2a}[/tex]  and x= [tex]\frac{-b-\sqrt{b^{2} -4ac } }{2a}[/tex]

x= [tex]\frac{2+\sqrt{4 -68 } }{2}[/tex]    and x= [tex]\frac{2-\sqrt{4 -68 } }{2}[/tex]

x= (2±8i)/2

x= 1±4i

So, the singularity points are x₁= 1+4i  and x₂ = 1-4i

Now, the ordinary points can be written as  z₁= 0+0i and z₂ = 1+0i

The minimum radius of convergence can be calculated as,

r₁ = | z₁ - x₁ |

   = | 0+0i-1-4i |

   = | -1-4i |

   = √17

   = 4.123

r₂ =  | z₂ - x₂ |

   = | 1+0i-1+4i |

   = | 4i |

   = √16

   = 4

Hence, the minimum radius of convergence R of power series solutions about the ordinary point x = 0 is 4.123 and that about the ordinary point x = 1 is 4 units.

To know more about radius of convergence

https://brainly.com/question/17193241

#SPJ4

No. It is not true that if B is produced by interchanging two rows of A, then detB = detA.

det(B) = -det(A) is the correct formula for calculating the determinant of a matrix obtained by interchanging two rows of another matrix.

Two rows of a matrix are interchanged, the determinant of the resulting matrix is equal to the determinant of the original matrix multiplied by -1.

Therefore, we have det(B) = -det(A).

This can be seen from the formula for calculating the determinant of a matrix.

When two rows are interchanged, the determinant of the resulting matrix is equal to the determinant of the original matrix multiplied by -1 raised to the power of the number of row interchanges.

Since we have interchanged two rows, the power is 2, so the determinant of the resulting matrix is equal to the determinant of the original matrix multiplied by (-1)² = 1.

det(B) = -det(A) is the correct formula for calculating the determinant of a matrix obtained by interchanging two rows of another matrix.

For similar questions on interchanging

https://brainly.com/question/17684395

#SPJ11

Answer:

mean   (1/6){92 + 97 + 53 + 90 + 95 + 98}

= 87.5

variance (1/6){(92-87.5)^2 + (97-87.5)^2 + (53-87.5)^2 + (90-87.5)^2 + (95-87.5)^2 + (98-87.5)^2}

= 245.6

standard deviation   √{1/6*[(92-87.5)^2 + (97-87.5)^2 + (53-87.5)^2 + (90-87.5)^2 + (95-87.5)^2 + (98-87.5)^2]}

= 15.7

A sample size of 329 would be required to be 99% confident that the estimated proportion of women-owned businesses not providing employee benefits is within 6 percentage points of the true population proportion.

To calculate the required sample size, we can use the formula:

n = ([tex]z^2[/tex] * p * q) /[tex]e^2[/tex]

where n is the sample size, z is the z-score corresponding to the desired level of confidence (in this case, 2.576 for 99% confidence), p is the estimated population proportion (0.165, based on the NWBC's finding), q is 1-p, and e is the maximum error we want to tolerate (in this case, 0.06 or 6 percentage points).

Substituting the values, we get:

n = (2.576^2 * 0.165 * 0.835) / [tex]0.06^2[/tex]

Solving for n, we get:

n ≈ 329

Therefore, a sample size of 329 would be required to be 99% confident that the estimated proportion of women-owned businesses not providing employee benefits is within 6 percentage points of the true population proportion. Note that this assumes a simple random sample and that the population size is much larger than the sample size, so the finite population correction is not needed.

Learn more about sample size

https://brainly.com/question/30100088

#SPJ4

The scale factor that does not belong with the other three is 2.

The scale factor that does not belong with the other three is determined as follows;

5/4 ------->  interpreted as a ratio of the new size to the original size, where the new size is 1.25 times larger than the original size.

60% ------->  interpreted as a percentage increase in size or quantity, where the new size is 1.6 times larger than the original size.

115% ------>  interpreted as a percentage increase in size or quantity, where the new size is 2.15 times larger than the original size.

2 is not a scale factor because it does not provide any information about the relationship between the new and original size or quantity.

Learn more about scale factor here: https://brainly.com/question/2826496

#SPJ4

Given the problem, X represents the number of cities among the five neighboring cities (located within 10 miles of each other) in which it will rain tomorrow. X can be a value ranging from 0 (no rain in any city) to 5 (rain in all cities).

Based on the given information, X is the random variable representing the number of cities among the five neighboring cities that will experience rain tomorrow. Since the cities are located within 10 miles of each other, it can be assumed that they are geographically similar and therefore have similar weather patterns. However, the probability of rain occurring in each city may still vary due to microclimates or other factors.

In order to determine the probability distribution of X, more information is needed such as historical weather data, current weather conditions, and any forecasts or predictions. Without this additional information, it is not possible to provide a specific answer to the question.

Visit here to learn more about  probability : https://brainly.com/question/30034780
#SPJ11

A polynomial equation to represent the volume of the pyramid V if its height is 10 meters is V = (10/3)x² - (40/3)x - 40.

To find the volume V of the pyramid, we need to multiply the area of its base B by one-third of its height h. In this case, we are given that the area of the rectangular base is B = x² - 4x - 12, and the height is h = 10 meters.

Therefore, the volume of the pyramid can be represented by the following equation:

V = (1/3)Bh

V = (1/3)(x² - 4x - 12)(10)

V = (10/3)x² - (40/3)x - 40

This is a polynomial equation in standard form, where the terms are arranged in descending order of degree. The degree of this polynomial is 2, which means that it is a quadratic equation.

In summary, to find the polynomial equation that represents the volume V of a pyramid with a rectangular base given by the polynomial equation B = x² - 4x - 12 and a height of 10 meters, we multiply the area of the base by one-third of the height, and simplify the resulting expression to obtain a polynomial in standard form with a degree of 2.

To learn more about volume click on,

https://brainly.com/question/30494734

#SPJ1

Complete question is:

The volume of a pyramid can be found by multiplying the area of its base B by one third of its height. The area of the rectangular base of a pyramid is given by the polynomial equation B=x²-4x-12

Write a polynomial equation to represent the volume of the pyramid V if its height is 10 meters. Write your answer in standard form.

Considering the expression of a line, the equation of the line that passes through the pair of points (-8,5) and (2,0) is y=-1/2x +1.

A linear equation o line can be expressed in the form y = mx + b

where

Knowing two points (x₁, y₁) and (x₂, y₂) of a line, the slope can be calculated using:

m= (y₂ - y₁)÷ (x₂ - x₁)

Substituting the value of the slope m and the value of one of the points, the value of the ordinate to the origin b can be obtained.

In this case, being (x₁, y₁)= (-8,5) and (x₂, y₂)= (2,0), the slope m can be calculated as:

m= (0 -5)÷ (2 - (-8))

m= (-5)÷ (2 +8)

m= (-5)÷ 10

m= -1/2

Considering point 2 and the slope m, you obtain:

0= (-1/2)×2 + b

0= -1 +b

0 + 1= b

1= b

Finally, the equation of the line is y=-1/2x +1.

Learn more about the equation of a line having 2 points:

brainly.com/question/16137599

#SPJ4

Step-by-step explanation:

You need to show us the function. To solve it you need to take f(x)=0 and solve for x, if x=-1 then -1 is a zero of a function.

The dimensions of the rectangle that minimize the perimeter are 18 feet by 18 feet.

To find the dimensions of a rectangle with an area of 324 square feet and the smallest possible perimeter, we need to minimize the perimeter while maintaining the given area. The area of a rectangle is given by the formula:

Area = length × width

Now, let's find the dimensions that result in the smallest perimeter.


The dimensions of the rectangle that minimize the perimeter are 18 feet by 18 feet.

1. We know the area is 324 square feet, so we can write the equation:

  324 = length × width

2. To minimize the perimeter, the rectangle should be as close to a square as possible because a square has the smallest possible perimeter for a given area.

3. Find the factors of 324 to determine which pair of numbers is closest to being equal. The factors are:

  1×324, 2×162, 3×108, 4×81, 6×54, 9×36, 12×27, and 18×18

4. Among these factor pairs, 18×18 is the closest to being equal, so the dimensions are 18 feet by 18 feet.

5. The smallest possible perimeter is achieved when the rectangle is a square with side lengths of 18 feet. The perimeter can be calculated as:

  Perimeter = 2 × (length + width) = 2 × (18 + 18) = 2 × 36 = 72 feet

So, the dimensions of the rectangle with an area of 324 square feet and the smallest possible perimeter are 18 feet by 18 feet, and the perimeter is 72 feet.

To know more about area of a rectangle visit:

brainly.com/question/8663941

#SPJ11

The series of transformations that can be used to justify that figure A is similar to figure B is: D. dilating figure A by a scale factor of 3 centered at the origin and then translating it up 2 units to create figure B.

In Geometry, a dilation is a type of transformation which typically changes the size of a geometric object, but not its shape.

In this scenario and exercise, we would dilate the coordinates of the pre-image (figure A) by applying a scale factor of 3 centered at the origin as follows:

(-2, 1) →  (-2 × 3, 1 × 3) = (-6, 3).

Next, we would apply a vertical translation 2 units up in order to create figure B;

(x, y)          →          (x, y + 2)

(-6, 3)         →          (-6, 3 + 2) = (-6, 5).

Read more on dilation and scale factor here: brainly.com/question/4421026

#SPJ4

Missing information:

The question is incomplete and the complete question is shown in the attached picture.

Using the following pattern and inductive reasoning, predicted answer to 9 x 7,654,321 - 1 is 73,888,889.

The pattern:

When you subtract 1 from a number that ends with a sequence of n consecutive digits (all equal to d), the result is a number that ends with the same n digits followed by ([tex]10^{n}[/tex] - 1) -d.

For example:

If you subtract 1 from a number that ends with three 7's, the result is a number that ends with three 6's, i.e., (777-1=776).

If you subtract 1 from a number that ends with four 2's, the result is a number that ends with four 1's, i.e., (2222-1=2221).

Applying this pattern to 9 x 7,654,321 - 1:

The number ends with one 9, so n=1 and d=9.

Therefore, the result will end with one 8 (one less than 9), followed by ([tex]10^{1}[/tex] - 1) - 9 = 0, i.e., it will end with 8.

So, the predicted answer is 73,888,889.

To learn more about inductive reasoning here:

https://brainly.com/question/13445962

#SPJ1

There are 396 different ways to pair up a team from league a with a team from league b and 153 different ways to pair up two teams from league a.

(a) To pair up a team from league a with a team from league b, we can use the fundamental counting principle which states that if we have m ways to do one thing and n ways to do another, then there are m x n ways to do both. Therefore, the number of ways to pair up a team from league a with a team from league b is:

18 x 22 = 396

(b) To pair up two teams from league a, we can use the combination formula which states that the number of ways to choose r items from a set of n items is nCr = n! / (r! (n-r)!). Since we want to choose 2 teams from a set of 18 teams in league a, we can use the formula:

18C2 = 18! / (2! (18-2)!) = 153

Therefore, there are 153 different ways topair up two teams from league a.

To know more about fundamental counting click on below link :

https://brainly.com/question/30869387

#SPJ11

The top-level view of an information system that shows the system's boundaries and scope is known as a context diagram. (Option a)

A context diagram is a visual representation of an information system that shows the system's boundaries, external entities, and the interactions between them. It is used to define the scope of the system and to identify the inputs and outputs of the system. A context diagram is a high-level diagram that provides an overview of the system, and it is often used as a starting point for the development of more detailed diagrams and models.

To create a context diagram, follow these steps:

By following these steps, you can create a clear and concise context diagram that provides a high-level overview of the information system.

Learn more about context diagram:

https://brainly.com/question/29601752

#SPJ4

Complete Question:

a top-level view of an information system that shows the system's boundaries and scope is known as which of the following? a. context diagram b. sequence flow diagram c.data relation diagram d. decision tree.

The F statistic for this data set is 1.93, with a p-value of 0.098. This means that we cannot reject the null hypothesis that there is no difference between the means of the cities at a significance level of 0.05.

Therefore, we cannot conclude that there is a significant difference in hotel costs per night between the five cities.

To find the value of the test statistic to test for a difference between cities, we need to perform a statistical test such as a one-way ANOVA (analysis of variance) test. This test compares the variation between the means of multiple groups to the variation within each group. The test statistic for a one-way ANOVA is F.

To calculate the F statistic, we need to first find the sum of squares within groups (SSW) and the sum of squares between groups (SSB). SSW measures the variation within each group and SSB measures the variation between groups.

SSW = ∑(xi – xj)² / df_within

where xi is the value of each observation, xj is the mean of each group, and df_within is the degrees of freedom within groups, which is equal to the total number of observations minus the number of groups.

SSB = ∑(xj – xbar)² / df_between

where xbar is the grand mean of all the observations, and df_between is the degrees of freedom between groups, which is equal to the number of groups minus one.

Once we have calculated SSW and SSB, we can calculate the F statistic as:

F = SSB / df_between / (SSW / df_within)

If the F statistic is greater than the critical value from the F distribution table, we can reject the null hypothesis that there is no difference between the means of the groups.

In this case, we have five cities: New York, Los Angeles, Atlanta, Houston, and Phoenix. We can use Excel or another statistical software to calculate the ANOVA test.

The F statistic of 1.93 and the associated p-value of 0.098 indicate that we cannot reject the null hypothesis at a significance level of 0.05. This suggests that there is no significant difference in hotel costs per night among the five cities: New York, Los Angeles, Atlanta, Houston, and Phoenix. The analysis was performed using a one-way ANOVA test, comparing the variation between the means of the cities to the variation within each city.

Learn more about null hypothesis here:

brainly.com/question/31525353

#SPJ11

Answer: I think C

Step-by-step explanation:

Okay, here is the frequency table for the given data:

Number of books Frequency

0 3

1 4

2 4

3 3

5 1

Let me walk you through how I created this frequency table:

   The data gives the number of books checked out by 15 students

   I listed the possible numbers of books (0, 1, 2, 3, 5) in the first column

   For each number, I counted how many times it appeared in the data.

   So 0 appears 3 times, so under frequency I wrote 3

   1 appears 4 times, so frequency is 4

   2 appears 4 times, so frequency is 4

   3 appears 3 times, so frequency is 3

   5 appears only once, so frequency is 1

Answer:

Last table

Step-by-step explanation:

Given-

0,3,2,3,2,1,1,0,1,2,5,1,2,3,1

As we can see based on the given, there are;

Two ⇒ 0

Five ⇒ 1

Four ⇒ 2

Three ⇒ 3

Zero ⇒ 4

One ⇒ 5

                          ---------------------------------------------------------------    

Number of Books ║   0     ║   1     ║   2     ║   3     ║   4      ║  5   ║

 Tally                      ║ ||        ║|||||     ║ ||||      ║ |||       ║           ║ |      ║

Frequency              ║ 2       ║  5      ║ 4       ║3        ║    0       ║ 1      ║

According to the tables given we can see that [D] also known as the last table matches the data given.

Xkavinsky-

Since the diagonals of a square are equal, they bisect each other and form 4 right angles.

Therefore, we have two congruent right triangles with legs x/2 and hypotenuse x. Using the Pythagorean theorem, we can solve for x:

(x/2)^2 + (x/2)^2 = x^2

2(x/2)^2 = x^2

x^2/2 = x^2

1/2 = 1

This leads to an absurdity, so there is no solution for x that satisfies the given conditions. Therefore, the answer is 4.0 Units.

Learn more about Pythagorean Theorem here:-brainly.com/question/343682

#SPJ11

The average study time of students is greater than 6.5 hours per week, at a significance level of 0.05.

What is the average?

This is the arithmetic mean and is calculated by adding a group of numbers and then dividing by the count of those numbers. For example, the average of 2, 3, 3, 5, 7, and 10 is 30 divided by 6, which is 5.

To test the claim that students on average spend more than 6.5 hours studying, we can use a one-sample t-test.

The null hypothesis is that the mean study time is equal to 6.5 hours:

H0: μ = 6.5

The alternative hypothesis is that the mean study time is greater than 6.5 hours:

Ha: μ > 6.5

We can calculate the test statistic using the formula:

t = (x - μ) / (s / √n)

where x is the sample mean, μ is the hypothesized population mean (6.5), s is the sample standard deviation, and n is the sample size.

Plugging in the values given in the problem, we get:

t = (7.2 - 6.5) / (2.8 / √120) = 3.18

Using a t-table with 119 degrees of freedom (df = n - 1), and a significance level of 0.05, the critical t-value for a one-tailed test (since we are testing for the mean being greater than 6.5) is 1.66.

Since our calculated t-value (3.18) is greater than the critical t-value (1.66), we can reject the null hypothesis.

Therefore, we have sufficient evidence to conclude that the average study time of students is greater than 6.5 hours per week, at a significance level of 0.05.

To learn more about the average visit:

https://brainly.com/question/20118982

#SPJ4

The range of the data set is determined as 22.5 cups.

The range of a data set is the difference between the maximum and minimum values.

Since each meal consists of 1.5 cups of food, the minimum value of the data set is 1.5 cups.

The maximum value is calculated as follows;

The maximum number of meals that Bingo can receive is calculated as;

= 24 / 1.5

= 16 meals

the maximum value of the data set is 1.5 cups x 16 meals = 24 cups.

the range of the data set is 24 cups - 1.5 cups = 22.5 cups

Learn more about range here: https://brainly.com/question/26098895

#SPJ4

The probability that a Jordanian couple is both sterile and infertile is 0.0384 or about 3.84%, given that 6% of Jordanian couples are sterile and 64% of sterile couples in Jordan are infertile.

Let S be the event that a couple is sterile and I be the event that the couple is infertile. We are given that P(S) = 0.06 and P(I|S) = 0.64.

We want to find P(S and I), the probability that a couple is both sterile and infertile. Using the conditional probability formula, we have

P(S and I) = P(I|S) * P(S)

Substituting the given values, we get

P(S and I) = 0.64 * 0.06

= 0.0384

Therefore, the probability that a Jordanian couple is both sterile and infertile is 0.0384 or about 3.84%.

To know more about Probability:

https://brainly.com/question/11234923

#SPJ4

So, the dimensions that give the largest printed area are 6.5 inches by 8 inches, with 1-inch margins at the bottom and sides, and a 2-inch margin at the top.

Let the dimensions of the printed area be x and y. Then we have:

The bottom margin is 1 inch, so the height of the poster is y + 2 + 1 = y + 3 inches.

The side margins are 1 inch each, so the width of the poster is x + 2 inches.

The top margin is 2 inches, so the height of the printed area is y.

Therefore, the total area of the poster is:

A = (y + 3) * (x + 2)

Expanding this expression, we get:

A = xy + 3x + 2y + 6

To maximize the printed area, we need to find the values of x and y that maximize A. To do this, we can use calculus. We differentiate A with respect to x and y, and set the derivatives equal to zero to find the critical points:

dA/dx = y + 3 = 0

dA/dy = x + 2 = 0

Solving these equations simultaneously, we get:

y = -3

x = -2

These values are not physically meaningful, since x and y represent dimensions of a poster and cannot be negative. However, they tell us that A has no local maxima or minima. Therefore, to maximize A, we need to consider the endpoints of the feasible region, which are determined by the margins.

The feasible region is a rectangle with height y = 11 - 2 - 1 = 8 inches and width x = 8.5 - 2 = 6.5 inches. Therefore, the maximum area is:

A = (8 * 6.5) - (3 * 2)

= 46 square inches

To know more about area,

https://brainly.com/question/22469440

#SPJ11

The language that Pattie and Jairo speak to each other upon meeting was Spanish.

Holly Goldberg Sloan's novel "Counting by Sevens" centers around Willow Chance, a math and science prodigy who finds difficulty in connecting with others emotionally.

Following an unforeseen incident that drastically alters her life, Willow meets various individuals whose guidance enables her to understand love, friendship, and family. When Pattie and Jairo first encounter each other, they communicate solely in Spanish. Overall, the book is an inspiring and reflective read, skillfully examining topics such as resilience, loss, grief, and community.

Find out more on Counting by Sevens at https://brainly.com/question/28226063

#SPJ1

Based on the given information, we know that one bicycle trail in a new housing development is 3 miles long and the other trail is the same length as the first trail.

Therefore, the length of the second trail is also 3 miles.

Hence, the answer is: 3 miles

It seems like there's a missing piece of information in your question about the length of the second trail.

However, I will try my best to help you with the given information.
Two bicycle trails are developed in the housing development.

The first trail is 3 miles long, and we need to find the length of the second trail.

Unfortunately, there is no information provided about the second trail's length.

For similar question on bicycle trail.

https://brainly.com/question/30963648

#SPJ11

Answer: 8b^2 + 9b + 3y + 5 =

Step-by-step explanation:

8b^2 + 9b + 3y + 5 =

the probability of obtaining between 55 and 69 tails, inclusive, is approximately 0.7171.

To use the normal distribution to approximate a binomial distribution, we need to use the following formula for the mean and standard deviation:

mean = n * p

standard deviation = sqrt(n * p * (1 - p))

where n is the number of trials, p is the probability of success for each trial.

In this case, n = 130 and p = 0.5 since the coin is fair. So we have:

mean = 130 * 0.5 = 65

standard deviation = sqrt(130 * 0.5 * (1 - 0.5)) = 5.6969 (rounded to four decimal places)

Now we can use the normal distribution to approximate the binomial distribution:

P(55 <= X <= 69) = P(Z <= (69 - 65) / 5.6969) - P(Z <= (55 - 65) / 5.6969)

where Z is a standard normal random variable

P(Z <= 0.7021) - P(Z <= -1.7546) = 0.7579 - 0.0408 = 0.7171 (rounded to four decimal places)

To learn more about probability visit:

brainly.com/question/30034780

#SPJ11