Using the Poisson distribution, it is found that:
There is a 0.3799 = 37.99% probability that the company will find 2 or fewer defective products in this batch.There is a 0.3975 = 39.75% probability that 4 or more defective products are found in this batch.Since [tex]P(X \geq 5) > 0.05[/tex], the company should not stop production it there are 5 defectives in a batch.What is the Poisson distribution?In a Poisson distribution, the probability that X represents the number of successes of a random variable is given by:
[tex]P(X = x) = \frac{e^{-\mu}\mu^{x}}{(x)!}[/tex]
The parameters are:
x is the number of successese = 2.71828 is the Euler number[tex]\mu[/tex] is the mean in the given interval.In this problem, the mean is:
[tex]\mu = 3.2[/tex]
The probability that the company will find 2 or fewer defective products in this batch is:
[tex]P(X \leq 2) = P(X = 0) + P(X = 1) + P(X = 2)[/tex]
In which:
[tex]P(X = x) = \frac{e^{-\mu}\mu^{x}}{(x)!}[/tex]
[tex]P(X = 0) = \frac{e^{-3.2}3.2^{0}}{(0)!} = 0.0408[/tex]
[tex]P(X = 1) = \frac{e^{-3.2}3.2^{1}}{(1)!} = 0.1304[/tex]
[tex]P(X = 2) = \frac{e^{-3.2}3.2^{2}}{(2)!} = 0.2087[/tex]
Then:
[tex]P(X \leq 2) = P(X = 0) + P(X = 1) + P(X = 2) = 0.0408 + 0.1304 + 0.2087 = 0.3799[/tex]
There is a 0.3799 = 37.99% probability that the company will find 2 or fewer defective products in this batch.
The probability that 4 or more defective products are found in this batch is:
[tex]P(X \geq 4) = 1 - P(X < 4)[/tex]
In which:
P(X < 4) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3).
Then:
[tex]P(X = x) = \frac{e^{-\mu}\mu^{x}}{(x)!}[/tex]
[tex]P(X = 0) = \frac{e^{-3.2}3.2^{0}}{(0)!} = 0.0408[/tex]
[tex]P(X = 1) = \frac{e^{-3.2}3.2^{1}}{(1)!} = 0.1304[/tex]
[tex]P(X = 2) = \frac{e^{-3.2}3.2^{2}}{(2)!} = 0.2087[/tex]
[tex]P(X = 3) = \frac{e^{-3.2}3.2^{3}}{(3)!} = 0.2226[/tex]
P(X < 4) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) = 0.0408 + 0.1304 + 0.2087 + 0.2226 = 0.6025
[tex]P(X \geq 4) = 1 - P(X < 4) = 1 - 0.6025 = 0.3975[/tex]
There is a 0.3975 = 39.75% probability that 4 or more defective products are found in this batch.
For 5 or more, the probability is:
[tex]P(X \geq 5) = 1 - P(X < 5)[/tex]
In which:
P(X < 5) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) + P(X = 4).
Then:
[tex]P(X = x) = \frac{e^{-\mu}\mu^{x}}{(x)!}[/tex]
[tex]P(X = 0) = \frac{e^{-3.2}3.2^{0}}{(0)!} = 0.0408[/tex]
[tex]P(X = 1) = \frac{e^{-3.2}3.2^{1}}{(1)!} = 0.1304[/tex]
[tex]P(X = 2) = \frac{e^{-3.2}3.2^{2}}{(2)!} = 0.2087[/tex]
[tex]P(X = 3) = \frac{e^{-3.2}3.2^{3}}{(3)!} = 0.2226[/tex]
[tex]P(X = 4) = \frac{e^{-3.2}3.2^{4}}{(4)!} = 0.1781[/tex]
P(X < 5) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) + P(X = 4) = 0.0408 + 0.1304 + 0.2087 + 0.2226 + 0.1781 = 0.7806
[tex]P(X \geq 5) = 1 - P(X < 5) = 1 - 0.7806 = 0.2194[/tex]
Since [tex]P(X \geq 5) > 0.05[/tex], the company should not stop production it there are 5 defectives in a batch.
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determine what type of model bets fits the given situation: A $500 raise in salary each year
The type of model that best fits the situation of a $500 raise in salary each year is a linear model.
In a linear model, the dependent variable changes a constant amount for constant increments of the independent variable.
In the given case, the dependent variable is the salary and the independent variable is the year.
You may build a table to show that for increments of 1 year the increments of the salary is $500:
Year Salary Change in year Change in salary
2010 A - -
2011 A + 500 2011 - 2010 = 1 A + 500 - 500 = 500
2012 A + 1,000 2012 - 2011 = 1 A + 1,000 - (A + 500) = 500
So, you can see that every year the salary increases the same amount ($500).
In general, a linear model is represented by the general equation y = mx + b, where x is the change of y per unit change of x, and b is the initial value (y-intercept).
In this case, m = $500 and b is the starting salary: y = 500x + b.
PLEASE HELP ASAP!!!!!!
Answer:
A. Using the commutative property
Step-by-step explanation:
Because there is no use of commutative property in the solution process.
Answer:
A) Using Commutative property
Step-by-step explanation:
In step 1, it used distributive property when the number 5 is distributed inside of the equation in the parenthesis.
In Step 4, dividing both sides by 10 to further simplify the equation
In step 2, you combined like terms and it results to the equation in step 3
x=1
x=3
z=x-25y
print(z)
The output of the program for the variable z is -22 or it returns an error if z = x - 25y
Evaluating the output of the programFrom the question, we have the following parameters that can be used in our computation:
x = 1
x = 3
z = x - 25y
print(z)
The value of the variable y is not given
So, the program would return an error
However, if the complete program is as follows (removing the variable y)
x = 1
x = 3
z = x - 25
print(z)
Using the above as a guide, we have the following:
The final value of x is 3
So, we have
z = 3 - 25
Evaluate
z = -22
This means that the output of the program for z is -22
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Adam’s prepaid card charges a one-time opening fee and a monthly fee. The table below shows his total fees after x months.
x # of months y total fees ($)
2 27
3
4
5 60
a. How much is the initial opening fee?
b. How much is the monthly maintenance fee?
c. Write an equation to model Adam’s fees over time.
Based on a system of equaitons, the initial opening fee (one-time payment) is $5.00, the monthly maintenance fee is $11.00, while an equation that models Adam's fees over time in months, x is y = 11x + 5.
What is a system of equations?A system of equations or simultaneous equations are two or more equations solved concurrently or at the same time.
An equation is a mathematical statement showing the equality or equivalence of two or more algebraic expressions.
While algebraic expressions combine variables with numbers and mathematical operands, equations use the equal symbol (=).
Total Fees after x months
x = # of months y = total fees ($)
2 27
3 38 (11 x 3 + 5)
4 49 (11 x 4 + 5)
5 60
Let w = the monthly maintenance fee
Let z = the one-time opening fee
Equations:5w + z = 60 ... Equation 1
2w + z = 27 ... Equation 2
Subtract Equation 2 from Equation 1:
3w = 33
w = 11
b) The monthly maintenance fee is $11.00.
a) The initial (one-time) opening fee is $5.00.
z = 60 - 55
= 5
c) The total fees after x months is y = 11x + 5.
Thus, the one-time opening fee and the monthly maintenance fee can be computed using a system of equations.
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Divide the sum 200 and 300 by the difference 80and 30.
Answer:
10
Step-by-step explanation:
300 plus 200 is 500
80 minus 30 is 50
500 divided by 50 is 10
which point lies in the solution set?
A. (4, –0.5)
B. (3, –2.5)
C. (–2.5, 4)
D. (–4.5, –3)
The point that lies in the solution set of (x - 2)²/25 + (y + 3)²/4 < 1 is B. (3, –2.5)
How to determine the point that lies in the solution set?From the question, we have the following inequality expression that can be used in our computation:
(x - 2)²/25 + (y + 3)²/4 < 1
Also, we have
A. (4, –0.5)
B. (3, –2.5)
C. (–2.5, 4)
D. (–4.5, –3)
Next, we test the options as follows
A. (4, –0.5)
(4 - 2)²/25 + (-0.5 + 3)²/4 < 1
1.7225 < 1 -- false
B. (3, –2.5)
(3 - 2)²/25 + (-2.5 + 3)²/4 < 1
0.1025 < 1 -- true
Hence, the point that lies in the solution set is B. (3, –2.5)
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Select the correct answer.
Which coefficient matrix represents a system of linear equations that has a unique solution?
The coefficient matrix A represents a system of linear equations that has a unique solution.
In a system of linear equations, the unique solution exists when the coefficient matrix has full rank and the determinant of the matrix is non-zero.
The other coefficient matrices listed do not have these properties.
1. [[6, 0, - 2]
- 2, 0, 6
1, - 2, 0]
has a determinant of zero, indicating that the system of equations is dependent and does not have a unique solution.
Similarly, the matrices
[5, 10, 5
4, 1, 4
- 1, - 2, - 1]
and, [2, 0, - 2
- 7, 1, 5
4, - 2, 0]
also do not satisfy the conditions for a unique solution.
Therefore, the coefficient matrix A represents a system of linear equations that has a unique solution.
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One shirt at H&M cost $7. what is the cost of 40 shirts
Answer:
$280
Step-by-step explanation:
7•40=$280
Find the equation of the line passing through the point (–1, 5) and perpendicular to the line y = – 3x + 4.
A) 3y = –x + 16
B) y = –3x + 8
C) y = –3x + 2
D) 3y = x + 16
Answer:
D
Step-by-step explanation:
the equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y- intercept )
y = - 3x + 4 ← is in slope- intercept form
with slope m = - 3
given a line with slope m then the slope of a line perpendicular to it is
[tex]m_{perpendicular}[/tex] = - [tex]\frac{1}{m}[/tex] = - [tex]\frac{1}{-3}[/tex] = [tex]\frac{1}{3}[/tex] , then
y = [tex]\frac{1}{3}[/tex] x + c ← is the partial equation
to find c substitute (- 1, 5 ) into the partial equation
5 = - [tex]\frac{1}{3}[/tex] + c ( add [tex]\frac{1}{3}[/tex] to both sides )
5 [tex]\frac{1}{3}[/tex] = c ⇒ c = [tex]\frac{16}{3}[/tex]
y = [tex]\frac{1}{3}[/tex] x + [tex]\frac{16}{3}[/tex] ( multiply through by 3 to clear the fractions )
3y = x + 16
A square has an area of 56 units, find the length of the side in simplest form. Has to be an Improper fraction.
The length of the side of the square in simplest form is 2sqrt(14).
The area of a square is given by the formula [tex]A = s^2[/tex], where A is the area and s is the length of a side.
We are given that the area of the square is 56 units, so we can set up the equation:
[tex]56 = s^2[/tex]
To solve for s, we can take the square root of both sides of the equation:
sqrt(56) = [tex]sqrt(s^2)[/tex]
We can simplify the square root of 56 by factoring it:
sqrt(56) = sqrt(222*7) = 2sqrt(14)
So, we have:
2sqrt(14) = s
This is an improper fraction because the numerator is larger than the denominator. Therefore, the length of the side of the square in simplest form is 2sqrt(14).
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A student has 40 dimes and nickels. Their total value is $2.95. If
de number of dimes and n= number of nickels, this system of equations
represents the situation:
d+n=40
0.10d+0.05n 2.95
How many of each type of coin are there? Solve the system to answer the
question.
A. 10 dimes and 30 nickels
B. 21 dimes and 19 nickels
C. 19 dimes and 21 nickels
D. 20 dimes and 20 nickels
c) Tan²60° × Sin60° x Tan30° x Cos²45°
The trigonometric relations are solved and equation is A = 3/4
Given data ,
Let the trigonometric relation be represented as A
Now , the value of A is
A = Tan²60° × Sin60° x Tan30° x Cos²45°
On simplifying the equation , we get
Tan²60° = 3
Sin60° = √3/2
Tan30° = 1/√3
And , Cos²45° = 1/2
Now , the equation is A = 3 x √3/2 x 1/√3 x 1/2
A = 3/4
Hence , the trigonometric equation is solved and A = 3/4
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top question only fast pls
The volume of the triangular prism is V = 18ft³
What is the volume of the prism?The volume of the prism is equal to the area of the triangular face, times the length of the prism, which is 9ft.
Remember that the area of a triangle of base B and height H is:
A = B*H/2
Here we can see that the base is 2ft and the height is 2ft, then the area of the triangular face is:
A = 2ft*2ft/2 = 2ft²
And thus, the volume of the prism is:
V = 2ft²*9ft
V = 18ft³
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what is the vertical distance betweenj (2, 11/3) and (2, -4/3)
The vertical distance between the two points given are (2, 11/3) and (2, -4/3) is 5 units.
The two points given are (2, 11/3) and (2, -4/3). These points have the same x-coordinate of 2, which means they lie on a vertical line. The vertical distance between the two points is simply the difference between their y-coordinates.
So, the vertical distance between the two points is:
11/3 - (-4/3) = 15/3 = 5
This means that if we were to draw a line segment connecting the two points, the length of the segment would be 5 units, and the segment would be parallel to the y-axis.
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3. In a data set, the mode, median, and mean are all equal. Which data set below fits this description? A. 26, 39, 39, 39, 52 B. 26, 27, 28, 28, 39 C. 15.0, 15.5, 16.0, 16.0, 21.5 105, 110, 110, 116, 120
What’s the value of x?
Answer:
The answer is 8
Step-by-step explanation:
/x/ // /8/
x=8
Which function has a horizontal asymptote at y = 3?
Answer: A) [tex]f(x)=\frac{6x^2-x+4}{2x^2-1}[/tex]
Step-by-step explanation:
Line [tex]y=L[/tex] is a horizontal asymptote of the function [tex]y=f(x)[/tex], if either [tex]\lim_{x \to \infty} f(x)=L[/tex] or [tex]\lim_{x \to \infty} f(x)=L[/tex], and [tex]L[/tex] is finite.
calculate the limits:
[tex]\lim_{x \to \infty} (\frac{6x^2-x+4}{2x^2-1})=3[/tex]
[tex]\lim_{x \to -\infty} (\frac{6x^2-x+4}{2x^2-1})=3[/tex]
Thus, the horizontal asymptote is [tex]y=3[/tex]
can someone please help me on this algebra 13 homework! PLS QUICK!
The function y=x+3 has the greatest y intercept.
The slope intercept form of a line is y=mx+b, where m is slope and b is the y intercept.
The given function is y=x, it has y intercept which is zero
The given function is y=-x, it has y intercept which is zero
Function is y=x+3, it has y intercept which is three
Function is y=2x, it has y intercept which is zero
Hence, the function y=x+3 has the greatest y intercept.
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100 Points! Algebra question. Photo attached. Sketch the angle. Then find its reference angle. Show your calculations. Thank you!
The required reference angle of 13π/8 is 3π/8.
The reference angle of an angle in standard position is the positive acute angle formed between the terminal side of the angle and the x-axis.
Given an angle of 13π/8, we can determine its reference angle as follows:
Angle: 13π/8
Since the angle is in the fourth quadrant, we subtract it from 2π (one full revolution) to find the reference angle:
Reference angle: 2π - 13π/8 = 3π/8
Therefore, the reference angle of 13π/8 is 3π/8.
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What is the length of side CB to one decimal place?
B
A
10
53°
C
▸
The length of side CB to one decimal place is 89.3.
To find the length of side CB in the given triangle, we can use the sine rule. The sine rule states that in a triangle, the ratio of the length of a side to the sine of its opposite angle is constant.
In this case, we have the angle C as 53° and the side opposite to it, side CB, as the unknown. Let's denote the length of side CB as x.
According to the sine rule:
sin(C) / x = sin(A) / AB
We know that angle A is 37° and AB is 120 units. Plugging in the values:
sin(53°) / x = sin(37°) / 120
To find x, we can rearrange the equation:
x = (120 * sin(53°)) / sin(37°)
Calculating this expression gives us:
x ≈ 89.32
Rounding this value to one decimal place, the length of side CB is approximately 89.3.
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find the expected value of the given variable with the following probability distribution
The expected value of the given variable with the probability distribution is 7
How to find the expected value of the variableFrom the question, we have the following parameters that can be used in our computation:
The probability distribution on the table of values
The expected value of the variable is calculated as
Expected value = ∑x * P(x)
Using the above as a guide, we have the following:
Expected value = 2 * 1/36 + 3 * 1/18 + 4 * 1/12 + 5 * 1/9 + 6 * 5/36 + 7 * 1/6 + 8 * 5/36 + 9 * 1/9 + 10 * 1/12 + 11 * 1/18 + 12 * 1/36
Evaluate
Expected value = 7
Hence, the expected value of the variable is 7
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A school asks students what type of sports they play. Complete the two-way table for the survey data. Find the answer for the missing letters and show your work as to how you arrived at each answer.
Answer: b: 58-22=36
A=37 68-22-9
d=99 37+62
c=29 34-9
Step-by-step explanation:
Find the y-intercept for the parabola defined by
this equation:
y=-4x^2-x+3
Answer:
y is 0,3
Step-by-step explanation:
To find the x-intercept, substitute in
0
for
y
and solve for
x
. To find the y-intercept, substitute in
0
for
x
Answer:
(0,3)
Step-by-step explanation:
Two methods:
Method 1: General method for any equation
Method 2: Method specific for parabolas in standard form
Method 1: General method for any equation
For any two-variable equation to be graphed, the y-intercept is the point where the graph crosses the y-axis. The y-axis is a vertical line through the origin (0,0).
Any y-intercept is on that line, and to get to that point starting from the origin, one can't travel left or right to get to the y-intercept point (without moving back to the y-axis). The only movement would be up or down.
Since no left-right movement will happen, the x-coordinate is zero.
For any two-variable equation, the x and y coordinates of any point on the graph are linked by the equation. If it is known that the x-value is zero, the y-value associated with that x-value is given by substituting zero into the equation everywhere there is an "x", and solving for "y".
[tex]y=-4x^2-x+3[/tex]
[tex]y=-4(0)^2-(0)+3[/tex]
Order of operations requires exponents before multiplication, or addition & subtraction...
[tex]y=-4(0)-(0)+3[/tex]
multiplication...
[tex]y=0-0+3[/tex]
addition & subtraction, from left to right...
[tex]y=3[/tex]
So, when the x-value is zero, the y-value is three. Therefore, the ordered pair representing that point is (0,3).
Method 2: Method specific for parabolas in standard form
The given equation is the equation for a parabola (as stated in the question), and it is given in "standard form": [tex]y=ax^2+bx+c[/tex], where a, b, and c are real numbers (and a isn't equal to zero, because then the x-squared term would be zero, and the equation would really just be a linear equation).
Note that for our equation, it is in standard form if we rewrite the equation to only use addition, [tex]y=-4x^2+-1x+3[/tex], where [tex]a=-4, ~b=-1 ~ \text{and}~c=3[/tex]
For a parabola in standard form, the y-intercept is always at a height of "c".
So, the y-intercept would be (0,3).
Can someone answer and provide an explanation for these problems?
The equation for each circle is given as follows:
36) (x - 2)² + (y - 15)² = 4.
37) (x + 8)² + (y + 18)² = 25.
38) (x - 11)² + (y + 9)² = 49.
39) (x - 13)² + (y + 8)² = 36.
What is the equation of a circle?The equation of a circle of center [tex](x_0, y_0)[/tex] and radius r is given by:
[tex](x - x_0)^2 + (y - y_0)^2 = r^2[/tex]
For item 36, the center is given as follows:
(-3, 11)
After the translation, the center will be given as follows:
(2, 15)
Hence the equation is given as follows:
(x - 2)² + (y - 15)² = 4.
For item 37, the center is given as follows:
(-3, -14)
After the translation, the center will be given as follows:
(-8, -18)
Hence the equation is given as follows:
(x + 8)² + (y + 18)² = 25.
For item 38, the center is given as follows:
(11, -9).
Hence:
(x - 11)² + (y + 9)² = r².
Point (18, -9) is on the circle, hence the radius squared is obtained as follows:
r² = (18 - 11)² + (-9 + 9)²
r² = 49.
Hence the equation is:
(x - 11)² + (y + 9)² = 49.
For item 39, the center is given as follows:
(13, -8).
Hence the equation is:
(x - 13)² + (y + 8)² = r².
Point (7, -8) is on the circumference of the circle, hence the radius squared is obtained as follows:
r² = (7 - 13)² + (-8 + 8)²
r² = 36.
Hence the equation is given as follows:
(x - 13)² + (y + 8)² = 36.
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Va rog!! Cineva rapid
Answer:18
Step-by-step explanation:
Julieta recorded the grade-level and instrument of everyone in the middle school School of Rock below. Seventh Grade Students Instrument # of Students Guitar 12 Bass 3 Drums 10 Keyboard 5 Eighth Grade Students Instrument # of Students Guitar 4 Bass 3 Drums 6 Keyboard 2 Based on these results, express the probability that a student chosen at random will play an instrument other than guitar as a fraction in simplest form.
The probability of a student chosen at random playing an instrument other than the guitar is 29/45.
To calculate the probability of a student playing an instrument other than the guitar, we need to determine the total number of students who play instruments other than the guitar and the total number of students in the middle school.
In the seventh grade, the number of students playing instruments other than the guitar is 3 (bass) + 10 (drums) + 5 (keyboard) = 18.
In the eighth grade, the number of students playing instruments other than the guitar is 3 (bass) + 6 (drums) + 2 (keyboard) = 11.
The total number of students playing instruments other than the guitar is 18 + 11 = 29.
Now, let's calculate the total number of students in the middle school by summing up the number of students in each grade:
Seventh grade: 12 (guitar) + 3 (bass) + 10 (drums) + 5 (keyboard) = 30
Eighth grade: 4 (guitar) + 3 (bass) + 6 (drums) + 2 (keyboard) = 15
The total number of students in the middle school is 30 + 15 = 45.
Therefore, the probability of a student chosen at random playing an instrument other than the guitar is 29/45.
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A researcher wishes to conduct a study of the color preferences of new car buyers. Suppose that 30% 30 % of this population prefers the color green. If 20 20 buyers are randomly selected, what is the probability that exactly 1 1 buyer would prefer green? Round your answer to four decimal places.
The probability that exactly 1 buyer would prefer green P ( A ) = 0.1854
Given data ,
A researcher wishes to conduct a study of the color preferences of new car buyers
And , 30 % of this population prefers the color green
where 20 buyers are randomly selected
Now , binomial distribution problem with n = 20, p = 0.30 and we want to find the probability of exactly 1 buyer preferring green.
The formula for the probability mass function of a binomial distribution is:
P(X = k) = (n choose k) * p^k * (1-p)^(n-k)
where (n choose k) = n! / (k! * (n-k)!)
Plugging in the values, we get:
P(X = 1) = (20 choose 1) * 0.30¹ * 0.70¹⁹
= 20 * 0.30 * 0.70¹⁹
= 0.1854 (rounded to four decimal places)
Hence , the probability that exactly 1 buyer would prefer green is 0.1854
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A family drove 592 miles during their trip this summer. In the winter they drove 376 miles during their trip . How many more miles did the family drive over the summer than over the winter . Explain !
Answer: 216
Step-by-step explanation:
592-376
592-300= 292
292-70= 222
222-6= 216
What is the end behavior of:
(2x ^ 2 - 5) / (x ^ 2 - 1)
A) x -> ∞ : f(x) -> 0
B) x -> ∞ : f(x) -> 2
C) f(x) -> - ∞ : x -> ∞
D) x -> ∞ : f(x) -> ∞
The given function does not have an end behavior because it is not a polynomial function.
What is the end behavior of a function?The end behavior of a function refers to how the function behaves or approaches as the input values (x-values) of the function become extremely large (approaching positive infinity) or extremely small (approaching negative infinity).The long term behavior of the function when x moves towards the ends of the coordinate plane can be predicted.
In a polynomial function, the leading coefficient and degree of the function often determine the polynomial function.
The given function is;
f(x) = 2x² - 5 / x² - 1
The end behavior of this function does not exist because this is not a polynomial.
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Suppose that 15% of all American use CNN as their primary source of news. A random sample of 200 Americans is selected. What is the probability that is your sample of 200 Americans that proportion that us CNN as their primary news source is at least 0.21?
The probability that in a sample of 200 Americans, the proportion that uses CNN as their primary news source is at least 0.21 is 49.6%.
What is the probability?The probability is determined using the normal approximation to the binomial distribution.
Given that the sample size is large (n = 200) and the probability of success (p = 0.15) is not too close to 0 or 1, the mean (μ) and standard deviation (σ) of the binomial distribution, will be:
μ = n * p
μ = 200 * 0.15
μ = 30
σ = √(n * p * (1 - p))
σ = √(200 * 0.15 * (1 - 0.15))
σ ≈ 4.29
Then, the z-score corresponding to the proportion of 0.21 is:
z = (x - μ) / σ
z = (0.21 - 0.15) / 4.29
z ≈ 0.014
Using a calculator, the probability of a z-score of 0.014 is approximately 0.504.
Hence, the probability of obtaining a proportion at least 0.21, is:
Probability = 1 - 0.504
Probability ≈ 0.496
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