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Stella [2.4K]
3 years ago
8

A survey about phone service has a margin of error of +/– 5%. Out of 100 people surveyed, 93 said that they were pleased with th

eir service. The phone company has 80,000 customers. What is the range of the number of people that are satisfied? A. 70,680 to 78,120 customers B. 70,580 to 78,120 customers C. 70,680 to 78,210 customers D. 70,080 to 78,120 customers
Mathematics
2 answers:
Dvinal [7]3 years ago
4 0

Answer:

Option A

Step-by-step explanation:

Given that a survey about phone service has a margin of error of +/– 5%

Out of 100 people surveyed, 93 said that they were pleased with their service.

Hence we can expect out of 80000 customers, 80000*93/100 customers would say they would be pleased with the service

i.e. 74400 would be average

The interval of range must have 74400 as mid value and on either side 5%

A) Mid point - 74400

This is the only range which has 74400 as mid value

So option A is right

Pani-rosa [81]3 years ago
3 0
I would say the answer is D. 70,080 to 78.120 and the reason I chose this answer is it's makes the most sense to me
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Brums [2.3K]

Answer:

5 4/9

Step-by-step explanation:

Convert a mixed number 2 19

to a improper fraction: 2 1/9 = 2 19 = 2 · 9 + 19 = 18 + 19 = 199

To find new numerator:

a) Multiply the whole number 2 by the denominator 9. Whole number 2 equally 2 * 99 = 189

b) Add the answer from previous step 18 to the numerator 1. New numerator is 18 + 1 = 19

c) Write a previous answer (new numerator 19) over the denominator 9.

Two and one ninth is nineteen ninths

Add: 19

9+ (-29) = 19 + (-2)9= 179

For adding, subtracting, and comparing fractions, it is suitable to adjust both fractions to a common (equal, identical) denominator. The common denominator you can calculate as the least common multiple of the both denominators - LCM(9, 9) = 9. In practice, it is enough to find the common denominator (not necessarily the lowest) by multiplying the denominators: 9 × 9 = 81. In the next intermediate step the fraction result cannot be further simplified by canceling.

In words - nineteen ninths plus minus two ninths = seventeen ninths.

Conversion a mixed number 3 59

to a improper fraction: 3 5/9 = 3 59= 3 · 9 + 59= 27 + 51 = 329

To find new numerator:

a) Multiply the whole number 3 by the denominator 9. Whole number 3 equally 3 * 99 = 279

b) Add the answer from previous step 27 to the numerator 5. New numerator is 27 + 5 = 32

c) Write a previous answer (new numerator 32) over the denominator 9.

Three and five ninths is thirty-two ninths

Add: the result of step No. 2 + 32

9= 179+ 329 = 17 + 329 = 499

For adding, subtracting, and comparing fractions, it is suitable to adjust both fractions to a common (equal, identical) denominator. The common denominator you can calculate as the least common multiple of the both denominators - LCM(9, 9) = 9. In practice, it is enough to find the common denominator (not necessarily the lowest) by multiplying the denominators: 9 × 9 = 81. In the next intermediate step the fraction result cannot be further simplified by canceling.

In words - seventeen ninths plus thirty-two ninths = forty-nine ninths.

7 0
3 years ago
Correct answer gets brainiest
Vadim26 [7]

Answer:

x + 2x + a + 90 \degree = 360\degree \\  x + 2x + 132\degree + 90 \degree = 360\degree \\ 3x + 222\degree = 360\degree \\ 3x = 360\degree - 222\degree \\ 3x = 138\degree \\ x =  \frac{138\degree}{3}  \\ \boxed{ x = 46\degree}

7 0
3 years ago
If x equals 12, find the value of x2​
eduard

Answer:

24

Step-by-step explanation:

12 * 2 = 24

7 0
3 years ago
Read 2 more answers
Tom is buying topsoil for the flower bed shown below. One bag of topsoil covers 151515 square meters. How many bags of topsoil d
exis [7]

Answer:

2 bags of topsoil.

Step-by-step explanation:

The attached figure shows a flower bed.

One bag of topsoil covers 15 square meters.

We need to find how many bags of topsoil does Tom need to cover his flower bed.

The area of the flower bed is :

A=\dfrac{1}{2}\times 12\times 5\\\\=30\ m^2  

Let he has to cover x bags of topsoil. So,

x = Area of flower bed/Area of 1 bag of top soil

x = 30/15

x = 2

Hence, he will need 2 bags of topsoil to cover his flower bed.

6 0
3 years ago
Through: (3,3), parallel to y=8/3x+5
pshichka [43]

Answer:

(0,5)

Step-by-step explanation:

5 0
3 years ago
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