MATHEMATICS HIGH SCHOOL

15% of what number equals 12

Answers

Answer 1
Answer:

.15x=12

x= 12/.15

x= 80

15% of 80 equals 12


I hope that's help !



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HIGH SCHOOL

Mrs. Martin directs two courses one chorus has 28 students the other chorus has 36 students for rehearsals she wants to divide each chorus into the largest possible equal groups with no students left over how many students will be in each group

Answers

Answer:4 students will be in each group.

Step-by-step explanation:

28 and 36. The 2 numbers are divisible by 4 without remainder

Answer:

4 students will be in each group.

Step-by-step explanation:

28 and 36. The 2 numbers are divisible by 4 without remainder

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HIGH SCHOOL

If the investor groups the franchises by type of food focused upon, and then uses simple random sampling to identify a proportionate number of franchises from each group, what kind of sampling is she doing

Answers

Answer:

Stratified random sampling or proportional random sampling

Step-by-step explanation:

Firstly, the franchises are divided into smaller groups depending on shared attributes or characteristics.

After the grupation, the investor uses simple random sampling to identify some further proportion.

Since small grups obtained by the division are known as strata, the investitor is doing stratified random sampling.

HIGH SCHOOL

All together, 3 people have 120 coins. mark has 3 times as many as joel, and joel has 1/2 as many as sandra. how many coins does sandra have?

Answers

Joel = j, Mark = m, Sandra = s
j + m + s = 120
m = 3j
j = 1/2 s --> s = 2j
plug in (substitute) each letter to make it in terms of only j: j + m + s = 120
j + 3j + 2j = 120
6j = 120
6j/6 = 120/6
j = 20
now plug in for the j & s equation:
s = 2j = 2(20) = 40
Therefore Sandra has 40 coins!
HIGH SCHOOL

A grocery store chain has been tracking data on the number of shoppers that use coupons. The data shows that 71% of all shoppers use coupons. 18 times out of 20 these results were considered accurate to within 2.5%. What is the margin of error?

Answers

Given:
71% of all shoppers use coupons.
18 times out of 20 these results were considered accurate to within 2.5%. 

71% represents the percentage of the whole population which is all the shoppers of grocery store.

18 times out of 20 refers to the confidence interval of the results.

18/20 * 100% =  90% 

2.5% is the range of accuracy in the 90% confidence interval. 

The margin of error is 2.5%. 

Answer:

0.025

Step-by-step explanation:

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