Answer:
25. y = 36
26. w = -4
Explanation:
25.
74 + 74 = 148
360 - 148 = 212
212 ÷ 2 = 106
106 = 2y + 34
106 - 34 = 2y
72 = 2y
72 ÷ 2 = (2y) ÷ 2
y = 36
26.
72 = 2w + 80
72 - 80 = 2w
-8 = 2w
-8 ÷ 2 = (2w) ÷ 2
w = -4
a friend has a 84% average before the final exam for a course. that score includes everything but the final, which counts for 15% of the course grade. what is the best course grade your friend can earn? % what is the minimum score your friend would need on the final to earn a 75% for the course? % give answers accurate to at least one decimal place. question helpquestion 17: video1message message instructor
The best course grade your friend can earn is 73.8% the minimum score would your friend would need on the final to earn a 75% for the course is 108%.
Given that,
Before the course's final exam, a friend had an 84% course average. Except for the final, which accounts for 15% of the course grade, everything else is included in that score.
We have to find what is your friend's best possible course grade and What grade on the final must your friend obtain in order to receive a 75% for the course.
We know that,
Best grade = (84%)(0.7) + (100%)(0.15)
Best grade=0.588+0.15
Best grade=0.738 or 73.8%
Now,
Let final = 15% of the grade
Let class work = (110%-15%)=95%
Let your friend minimum score =f
So,
70%(0.84) + 15%(final) = 75%
0.7(0.84) + 0.15f = 0.75
0.588 + 0.15f = 0.75
Collect like terms
0.15f=0.75-0.588
0.15f = 0.162
Divide both side by 0.15f
f=0.162/0.15
f =1.08 or 108%
Therefore, the best course grade your friend can earn is 73.8% the minimum score would your friend would need on the final to earn a 75% for the course is 108%.
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Please help me I’m really confused on this.
The value of a in the diagram is 24°
What is a triangle?a triangle is a three-sided polygon that consists of three edges and three vertices. The most important property of a triangle is that the sum of the internal angles of a triangle is equal to 180 degrees. This property is called angle sum property of triangle.
From the diagram the three angles of the triangle are a + 36, 3a, 2a
a + 36 + 2a + 3a = 180( sum of angles in a triangle is 180°)
6a + 36 = 180
6a = 180 - 36
6a = 144
a = 144/6
a = 24°
In conclusion the value of a is 24°
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You and your friends order a meal for $149.58. How much should you leave (including tip) if you want to leave an 18% tip?
The total amount that should be left including 18% tip is $176.5
What is percentage?
A figure or ratio stated as a fraction of 100 is called a percentage. Frequently, it is indicated with the percent sign, "%". A % is a number without dimensions and without a standard measurement.
We are given that you and your friend ordered a meal worth of $149.58
Now also we want to leave a tip of 18% of the total amount.
Hence the total amount that should be left is needed to be calculated
To do that we first calculate the 18% of the total amount then add it to the original amount
18% of the total value is
[tex]149.58*\frac{18}{100}\\ =26.92[/tex]
This is the value of tip that needed to be given
Now we add this to the original price
We get
149.58+26.92
=176.50
The total amount that needs to be paid with tip is $176.5
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Question 2 Find the margin of error for the survey results described. In a survey of 125 adults, 30% said that they had tried acupuncture at some point in their lives. Give your answer as a decimal to three decimal places. a. 0.045 b. 0.089 c. 0.179 d. 0.008
There are 125 participants in this sample. Thus, the margin of error = (1.96) x (0.5/√125) = 0.089
Margin of Error = (Critical value) x (Standard Deviation/Square root of Sample Size)
Critical value = 1.96
Standard Deviation = (30% x 70%)^0.5 = 0.5
Sample Size = 125
Therefore, Margin of Error = (1.96) x (0.5/√125) = 0.089
The margin of error for the survey results described can be calculated using the formula (Critical value) x (Standard Deviation/Square root of Sample Size). A 95% confidence interval's critical value is 1.96.The standard deviation is calculated by taking the square root of the product of the sample proportion (30%) and its complement (70%). There are 125 participants in this sample. Thus, the margin of error = (1.96) x (0.5/√125) = 0.089
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add the following polynomials, then place the answer in the proper location on the grid. write the answer in descending powers of x. find the sum of 4x 3 2x 2 - 4x 3 and 7x 3 -4x 2 7x 8.
The sum of the two polynomials 4x³+2x²-4x+3 and 7x³-4x² +7x+8 is 11x³-2x²+3x+11.
Algebraic expressions called polynomials include coefficients and variables. For polynomial expressions, we can perform mathematical operations like addition, subtraction, multiplication, and positive integer exponents. Polynomial addition is the process of adding like terms from two or more algebraic equations while maintaining the sign of each term.
Here, given two polynomials 4x³+2x²-4x+3 and 7x³-4x² +7x+8.
First, arrange the given polynomials. The polynomials were already arranged from the increasing to decreasing order of degree. Then,
(4x³+2x²-4x+3)+ (7x³-4x² +7x+8)
Second, group the like terms from both polynomials.
(4x³+7x³)+(2x²-4x²)+(-4x+7x)+(3+8)
Now, simplifying the combining terms, we get,
11x³-2x²+3x+11
The answer is 11x³-2x²+3x+11.
The complete question is -
Add the following polynomials, then place the answer in the proper location on the grid. write the answer in descending powers of x. Find the sum of 4x³+2x²-4x+3 and 7x³-4x² +7x+8.
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how many roots does this polynomial equation have ? 2x^4+5x^3-3x^2-5
The number of roots the polynomial equation 2x⁴ + 5x³ -3x² - 5 have is 4
How to determine the number of roots the polynomial equationFrom the question, we have the following parameters that can be used in our computation:
2x^4+5x^3-3x^2-5
Express the polynomial expression properly using proper superscripts
So, we have the following representation
2x⁴ + 5x³ -3x² - 5
The degree of a polynomial is the number of roots in it
This means that
Degree = 4
So, we can conclude that the polynomial equation 2x⁴ + 5x³ -3x² - 5 has 4 roots
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The weather forecast shows a 60% chance of rain. If it does not rain then there is an 80% chance of going to the beach. What is the probability of going to the beach?
Answer: 32% probability of going to the beach given the information provided in the weather forecast.
Step-by-step explanation:
The probability of going to the beach is equal to the probability of it not raining times the probability of going to the beach if it does not rain. Therefore, the probability of going to the beach is equal to (1 - 0.6) * 0.8 = 0.4 * 0.8 = 0.32.
I need this please help me
Answer: m∠A = 72°, m∠C = 56°
Step-by-step explanation: All triangles interior angles add up to 180, This is an isosceles triangle which by rule mean that angles m∠A and m∠B and the same value of 72°. Now it becomes an equation to find m∠C, of
72 + 72 + x = 180.
144 + x = 180
x = 56
3. The quilt is made of squares with diagonals. (Lesson 3-12)
The length of BD is 4.
a. Find the length of AE.
Answer:2
Step-by-step explanation:took a test
Use the drop-down menus to complete each statement about the functions f and g
Note: Exponential functions are of the form f(x) = ab^x
-linear/exponential/neither
-differences/quotients
-constant/non-constant
A function is classified as exponential if when the input variable is changed by one, the output variable is multiplied by a constant.
Hence, in this problem, the function g(x) is exponential, as when the input x is increased by one, the output g(x) is multiplied by two.
A function is classified as linear if when the input variable is changed by one, the output variable is increased/decreased by a constant.
Hence, in this problem, the function f(x) is linear, as when the input x is increased by one, the output f(x) is increased by a constant of six.
Missing InformationThe problem is given by the image shown at the end of the answer.
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Raquel is playing a game where she throws a ball that paper called a trash ball into her trashcan the diameter of the top of the trashcan is 20 inches Raquel once the trash ball to have a diameter that is 1/4 the diameter of the top of the trashcan what should the timing of Raquel trash Be?
The diameter of the top of the trash ball is 5 inch.
What is a diameter?A straight line that runs through the middle of a body or figure from the sideways particularly a circle or sphere is called as a diameter of a circle or sphere.
Given that the diameter of top of the trash can is 20 inch.
And the diameter of trash ball is 1/4th of the diameter of trash can.
The diameter of trash ball = 1/4 ( the diameter of trash can )
The diameter of trash ball = 1/4 (20 inch)
The diameter of trash ball = 20/4
The diameter of trash ball = 5 inch.
Therefore, the diameter of the top of the trash ball is 5 inch.
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The complete question is;
Raquel is playing a game where she throws balled-up paper called a “trash ball” into her trash can. The diameter of the top of the trash can is 20 inch . Raquel wants the “trash ball” to have a diameter that is 1/4 the diameter of the top of the trash can. What should the diameter of Raquel's “trash ball” be? .
I need help solving for Y.
I know that x = 11 but I need help finding Y. Please help, Thanks.
Answer: 11
Step-by-step explanation:
plug in x where eligible
4(11)-10 and 2(11)+12
both equal 34 and since a triangle's interior angles always equal 180 you can solve for the 3rd angle 32*2= 64 then 180-64= 116
The distance s that an object falls varies directly with the square of the time, t , of the fall. If an object falls 16 feet in one second, how long will it take for it to fall 112 feet?
After 3 seconds will it take for it to fall 112 feet.
What is distance?
Distance is a measurement of how far apart two objects or points are, either numerically or occasionally qualitatively. Distance can refer to a physical length in physics or to an estimate based on other factors in common usage.
Given:
The distance s that an object falls varies directly with the square of the time, t , of the fall.
⇒ D = KT^2
Where D is the distance
T is the time
K is the proportionality constant
As an object falls 16 feet in one second.
⇒ D = 16, T = 1
⇒ 16 = K(1)^2
16 = K
Therefore, the equation becomes
D = 16T^2
To find the how long will it take for it to fall 112 feet.
Here D = 112 feet
Plug D = 112 in the above equation.
112 = 16T^2
7 = T^2
T = √7
T = 2.65
T ≈ 3
Hence after 3 seconds will it take for it to fall 112 feet.
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(10x^2)^-3
Simplify the exponential equation
Simplifying an exponential equation can be done by using different laws of exponents.
In this case, we can use the power rule and negative exponent rule
Power rule:
[tex](a^x)^y=a^x^y[/tex]
Negative exponent rule:
[tex]a^-^y=\frac{1}{a^y}[/tex]
1. Use the negative exponent rule
[tex](10x^2)^-^3=\frac{1}{(10x^2)^3}[/tex]
2. Use the power rule and simplify
-3 has to be applied to 10 and x^2[tex]10^3=1000[/tex] and [tex](x^2)^3=x^6[/tex]
∴[tex]\frac{1}{1000x^6}[/tex]
Answer:
= 10x⁻⁶
Step-by-step explanation:
2*-3 = -6
then:
[tex]10x^{2^{-3}} = 10x^{-6}[/tex]
= 10x⁻⁶
Find the value of X that makes m n
8
x = 6
9
x=7
10
x= 15
see explanation in image
because you know that m and n are parralell you can use the vertical angle theorem as well as the fact that lines in a straight angle add to 180
if you have any questions just comment
NASA launches a rocket at t = 0 seconds. Its height, in meters above sea-level, as a function of time is
given by h(t) - 4.9t² + 94t + 129.
=
Assuming that the rocket will splash down into the ocean, at what time does splashdown occur?
seconds. (Round your answer to 2 decimals.)
The rocket splashes down after
How high above sea-level does the rocket get at its peak?
The rocket peaks at
Add Work
Submit Question
meters above sea-level. (Round your answer to 2 decimals.)
Answer:
h(t) - 94t + 129.
Step-by-step explanation:
A pressure treated post will be placed in a sonotube. The post is 5.5" square and the tube is 10" in diameter, 48" long. The tube will then be filled with quickrete.
30 - 40lb bags equals 1 cubic yard
Formulas: V = pi^2h, V = L x W x H
How many bags will it take to fill the tube?
Answer:
So, it will take between 4 and 5 bags of quickrete to fill the tube.
Step-by-step explanation:
To find the volume of the sonotube, you can use the formula for the volume of a cylinder: V = πr^2h, where r is the radius of the tube and h is the height.
First, you need to find the radius of the tube. The diameter of the tube is 10 inches, so you can divide that by 2 to get the radius: r = 10 inches / 2 = 5 inches.
Then, you can plug the radius and height into the formula to find the volume of the tube: V = πr^2h = π(5 inches)^2(48 inches) = about 235.61 inches^3.
To find the number of bags of quickrete you will need to fill the tube, you need to convert the volume of the tube to cubic feet and then divide by the number of cubic feet in a bag of quickrete.
First, you can convert the volume of the tube to cubic feet by dividing by 1728 (the number of cubic inches in a cubic foot): V = 235.61 inches^3 / 1728 inches^3/ft = about 0.14 cubic feet.
Then, you can divide this volume by the number of cubic feet in a bag of quickrete to find the number of bags you need: 0.14 cubic feet / (1 cubic foot / 30-40 bags) = about 4-5 bags.
So, it will take between 4 and 5 bags of quickrete to fill the tube.
Write the equation in slope-intercept form.
y+2=1/6(x−4)
Answer:
Step-by-step explanation:
First: You do PEMDAS.
Second: you do what in your parentheses
which of these steps will eliminate a variable in this system 6x - 3y = 8
23 + 6y = 16
The values of x and y after solving this system of equations will be 32/35 and -88/105 respectively.
What are system of equations?System of equations are a set of two or more equations that contain variables. The values of the variables can be calculated using either method of elimination or substitution. The values of the variables must then satisfy all the equations.
What is the method of elimination?For a set of two equations, in elimination we make the coefficient of any one variable equal to the coefficient of the same variable in the other equation. This can be done by multiplying or dividing the whole equation accordingly. Then we subtract the equations from each other and solve for one variable.
6x - 3y = 8 (multiplying this equation by -2 to make the coefficient of y equal to that of in the equation 23x + 6y = 16)
Now are equations are
-12x + 6y = -16 and 23x + 6y = 16
subtracting eq 1 from eq 2 gives,
35x = 32 (Note that y has now been eliminated)
x = 32/35
Substituting this value of x in any one of the equations will then give the value of y to be -88/105
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What is the circumcenter of a triangle formed by (4,2), (3,-3) and (2,2)?
The circumcenter of a triangle formed by (4,2), (3,-3) and (2,2) is located at (3, -0.4).
The circumcenter of a triangle is the point of intersection of the three perpendicular bisectors of the sides of a triangle.
Let A = vertex at (4,2)
B = vertex at (3,-3)
C = vertex at (2,2)
Get the midpoint of each side.
midpoint = [(x₂ + x₁)/2 , (y₂ + y₁)/2]
side AB : midpoint = [(3 + 4)/2 , (-3 + 2)/2] = (3.5, -0.5)
side AC : midpoint = [(4 + 2)/2 , (2 + 2)/2] = (3, 2)
side BC : midpoint = [(3 + 2)/2 , (-3 + 2)/2] = (2.5, -0.5)
Get the slope of each side.
slope = (y₂ - y₁) / (x₂ - x₁)
side AB : slope = (-3 - 2) / (3 - 4) = 5
side AC : slope = (2 - 2) / (2 - 4) = 0/-2 = 0
side BC : slope = (2 - -3) / (2 - 3) = -5
Determine the equation of the line of each of the three perpendicular bisectors of the sides of a triangle, that passes through the midpoint and with a slope equal to the negative reciprocal of the slope of the side.
y = mx + b
perpendicular bisector of AB :
-0.5 = -1/5(3.5) + b ; b = 0.2 ; y = -1/5x + 0.2
perpendicular bisector of AC :
since AC is a horizontal line, x = 3
perpendicular bisector of BC :
-0.5 = 1/5(2.5) + b ; b = -1 ; y = 1/5x - 1
Since x is already equal to 3, substitute the value of x in the two other equation and solve for y.
y = -1/5x + 0.2
y = -1/5(3) + 0.2
y = -0.4
y = 1/5x - 1
y = 1/5(3) - 1
y = -0.4
Hence, the circumcenter of the triangle is located at (3, -0.4).
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CAN SOMEONE HELP WITH THIS QUESTION?✨
The value of [tex]sin^{-1}[/tex](- [tex]\frac{\sqrt{2} }{2}[/tex]) in radians is [tex]-\frac{\pi }{4}[/tex]
The value of [tex]sin^{-1}[/tex](1) in radians is [tex]\frac{\pi }{2}[/tex]
The value of [tex]sin^{-1}[/tex](- 1/2) is [tex]-\frac{\pi }{6}[/tex]
What are trigonometric ratios?Trigonometric Ratios are defined as the values of all the trigonometric functions based on the value of the ratio of sides in a right-angled triangle. The ratios of sides of a right-angled triangle with respect to any of its acute angles are known as the trigonometric ratios of that particular angle.
[tex]sin^{-1}[/tex](- [tex]\frac{\sqrt{2} }{2}[/tex]) is -45 in degress
but [tex]\pi[/tex] rad = 180°
so that - 45° in rad is [tex]\pi[/tex] x - 45/180 which is - [tex]\frac{\pi }{4}[/tex]
[tex]sin^{-1}[/tex](1) = 90°
but [tex]\pi[/tex] rad = 180°
so that -90° in rad is [tex]\pi[/tex] x 90/180 which is [tex]\frac{\pi }{2}[/tex]
[tex]sin^{-1}[/tex](- 1/2) = -30°
but [tex]\pi[/tex] rad = 180°
so that - 30° in rad is [tex]\pi[/tex] x - 30/180 which is - [tex]\frac{\pi }{6}[/tex]
In conclusion then values of the sine inverse of the functions are - [tex]\frac{\pi }{4}[/tex], [tex]\frac{\pi }{2}[/tex], and - [tex]\frac{\pi }{6}[/tex]
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An angle measures 1.2 radians and the initial ray of the angle points in the 3-o'clock direction. A circle is centered at the angle's vertex. 1. rad a. The terminal point is how many radii to the right of the circle's center? radii b. The terminal point is how many radii above the circle's center? radii
The terminal point is 0.36 radii to the right of the circle's center.
The terminal point is 0.93 radii above the circle's center.
Here, the 3 O'clock line is OA and the terminal point is on the line OP.
The angle θ = 1.2 radians
Let the radius = r
The distance of the terminal point to the right of the center = OQ
= r × cos θ
= r × cos 1.2
= r × 0.36
So, it is equal to 0.36 radii
The distance of the terminal point above the center = PQ
= r × sin θ
= r × sin 1.2
= r × 0.93
So, it is equal to 0.93 radii.
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what are the solutions to this system of equations 2x y 3 y 3 2 x 2 2
The solutions to the system of equations 2x + y = 3 and y - 3 = 2x - 2 are (1,5) and (-2,-1).
What formulae are used?A mathematical statement that has two expressions with equal values separated by the symbol "equal to" is called an equation. Consider the formula 3x + 5 = 15. Different types of equations exist, including linear, quadratic, cubic, and others. Let's read this article to learn more about math equations.
What is an equation example?The definition of an equation in algebra is a mathematical statement proving the equality of two mathematical expressions. For instance, the equation 3x + 5 = 14 has the two expressions 3x + 5 and 14 that are separated by the 'equal' sign.
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two equilateral triangles are contained in a square whose side length is $2\sqrt{3}$. the bases of these triangles are opposite sides of the square, and their intersection is a rhombus. the area of the rhombus can be expressed in the from $a b\sqrt{c}$ for integers $a,b,$ and $c$ such that $c$ square-free. determine $-a b c$.
The area of the rhombus inside a square formed by two equilateral triangles is 1.856 cm².
Here we have to find the area of the rhombus.
Data given:
sides of a square = 2√3 cm
Let ABCD be a square whose sides are 2√3 cm.
As two triangles are inscribed in a square so ABE and CDG be equilateral triangles in square ABCD.
The altitude of the equilateral triangle ABE and CDE = 2√3 sin 60°
= 2√3 × √3/2
= 3cm
The diagonal EG of the rhombus EFGH = 2√3 - 2(2√3 - 3)
= 2.535 cm
The diagonal FH of the rhombus, EFGH = 2√3 - 2(√3tan 30°)
= 1.464 cm
The formula for the area of the rhombus = d1 × d2 / 2
where d1 and d2= diagonal of a rhombus
Now the area of the rhombus EFGH = EG × FH / 2
= 2.535 × 1.464 / 2
= 1.856 cm².
Therefore the area of the rhombus is 1.856 cm².
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What qualities does a regular polygon have select all that apply?
Answer: Two dimensions.
Straight sides.
Congruent (equal-length) sides.
An interior and exterior.
Equal interior angles.
Equal exterior angles.
Step-by-step explanation:
Which statement is NOT sufficient to prove the congruence of two triangles?
A. Two angles and the included side of one triangle are congruent respectively to the two angles and the included side of another triangle.
B. Two sides of one triangle are congruent respectively to the two sides of another triangle
C. Two angles and the non-included side of one triangle are congruent respectively to the two angles and the non-included side of another triangle.
D. Three sides of one triangle are congruent respectively to the three sides of another triangle.
Option B is the statement which is not sufficient to prove the congruence of two triangles.
In all the other options we get to know about three parts of the triangle using which we can prove their congruency .
Option B says ,
Two sides of one triangle are congruent respectively to the two sides of another triangle.
In this statement there is no mention about the third side or a third angle.
Therefore, using option B we cannot prove the congruence of two triangles.
If all three corresponding sides and all three corresponding angles are equal in size, two triangles are said to be congruent.
" ≅ " is the congruence symbol.
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Which of the following is NOT a geometric sequence?A. 3, 6, 9, B. 3, 9, 27,... C. 4, 8, 16, D. 7, -7, 7, -7...
Of the following, a sequence which is not a geometric sequence is 3, 6, 9, ... (Option A)
A geometric sequence refers to a sequence in which each term is determined by multiplying the preceding term by the same value which is called the common ratio (r). Hence, the common ratio determined by dividing a term by preceding term is constant in a geometric sequence.
In the given options,
A) r = 6/3 ≠ 9/6
B) r = 9/3 = 27/9 = 3
C) r = 8/4 = 16/8 = 2
D) r = -7/7 =7/-7 = -7/7 = -1
As the common ratio r is constant for option B, C and D, they are geometric sequences. The ratio between consecutive terms is not the same for option A, it is not a geometric sequence.
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The universities budget covers cost for nine months what is Amy’s monthly budget for textbooks in course supplies? What is her monthly budget for rent on utilities and food? What is your monthly budget for a personal and miscellaneous cost? what is her total monthly budget?
We can compute Amy's monthly budget for each question using division operations, as follows:
1. Amy's monthly budget for textbooks and course supplies is $100.
2. Amy's monthly budget for rent, utilities, and food is $1,422.
3. Amy's monthly budget for personal and miscellaneous costs is $251.
4. Amy's total monthly budget is $1,825.
How to determine the monthly budget:The total monthly budget is the total budget divided by the period (nine months).
Division operations can be used to determine the individual monthly budgets for each expense class by dividing the total cost by 9.
Living On/Off-Campus:Textbooks and Course Supplies = $900 $100
Rent, Utilities, and Food = $12,798 $1,422
Personal & Miscellaneous Expense = $2,259 $251
Transportation = $468 $52
Total non-tuition expenses = $16,425 $1,825 ($16,425/9)
The number of months for the year = 9 months
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what percent of a dollar is the value of each coin combination
a) A dollar is 40% of four dimes.
b) 8% of a dollar is equal to 1 nickel and 3 cents.
c) A dollar is equal to 135% of 5 quarters and 1 dime.
What is meant by percentage?A value or ratio stated as a fraction of 100 is known as a percentage in mathematics. Frequently, the percent symbol (%) or the abbreviation "pct" are used to indicate the percentage. The word "percent" derives from "percent," a contraction of "per centum," which meant per hundred.
1 dime equals 10 cents, as we all know. Thus, 4 dimes equal 40 cents. 4 dimes are consequently 40% of a $1.
We are aware that a nickel costs five cents and a penny one cent. Therefore, 8% of a dollar is equal to 1 nickel and 3 cents.
We are aware that a quarter equals 25 cents and a dime equals 10 cents. 5 quarters and 1 dime are therefore 135% of a dollar.
Therefore,
A dollar is 40% of four dimes.
8% of a dollar is equal to 1 nickel and 3 cents.
A dollar is equal to 135% of 5 quarters and 1 dime.
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The complete question is:
"What percentage of a dollar is the value of each coin combination?
a. 4 dimes
b. 1 nickel and 3 pennies
c. 5 quarters and 1 dime"
Please help! I’ll mark the brainliest please!
A salon wants to conduct a survey in order to study the consumption pattern of its consumers. The population mean spending on visiting salon per month is unknown with the population standard deviation is assumed to be $200. A random sample of 55 customers is selected and the sample mean spending on visiting salon per month is $800.
(a) Construct a 95% confidence interval estimate for the population mean spending by a customer on visiting salon per month.
(b) It is suggested to do the second round inspection. This time, the sample size is 120. What is the sampling error at 95% confidence level?
a) The 95% confidence interval estimate for the population mean spending by a customer on visiting salon per month is given as follows:
(747, 853).
b) The sampling error at the 95% confidence level is of: 35.8.
How to obtain the confidence interval?We have the standard deviation for the population is known, hence the z-distribution is used to calculate the confidence interval.
The equation that gives the bounds of the confidence interval is presented as follows:
[tex]\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}[/tex]
In which the variables used to calculated these bounds are listed as follows:
[tex]\pi[/tex] is the sample proportion, which is also the estimate of the parameter.z is the critical value.n is the sample size.The confidence level is of 95%, hence the critical value z is the value of Z that has a p-value of [tex]\frac{1+0.95}{2} = 0.975[/tex], so the critical value is z = 1.96.
The remaining parameters are given as follows:
[tex]\overline{x} = 800, \sigma = 200, n = 55[/tex]
Then the lower bound of the interval is calculated as follows:
800 - 1.96 x 200/square root of 55 = 747.
The upper bound of the interval is calculated as follows:
800 + 1.96 x 200/square root of 55 = 853.
For a sample size of n = 120, the sampling error is obtained as follows:
Sampling error = 1.96 x 200/square root of 120 = 35.8.
More can be learned about the z-distribution at https://brainly.com/question/25890103
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