SOLUTION: Laura will compute the mean of 3 numbers and express her answer to 2 decimal places. For which set of numbers will her answer be exact? A. {12, 31, 42} B. {15, 30, 4

Algebra ->  Probability-and-statistics -> SOLUTION: Laura will compute the mean of 3 numbers and express her answer to 2 decimal places. For which set of numbers will her answer be exact? A. {12, 31, 42} B. {15, 30, 4      Log On


   

Question 605788: Laura will compute the mean of 3 numbers and express her answer to 2 decimal places. For which set of numbers will her answer be exact?
A.
{12, 31, 42}

B.
{15, 30, 40}

C.
{17, 31, 45}

D.
{18, 36, 50}
Answer by mathie123(224) About Me  (Show Source):
You can put this solution on YOUR website!
For this one, you will have to compute the mean of each set of 3 numbers and see which sets have exactly two decimal places (or none or 1 as we can add a 0 onto it eg. 1=1.00)

I will do A for you and let you do the others.
mean of A=%2812%2B31%2B42%29%2F3
=28.3333333333333333333
So that one is NOT one of the number sets the work.
Try the rest out and let me know if you have any problems:)