Question

A local car dealership advertises cars that get the following miles per gallon:15, 22, 36, 30, 38, 21
Find the variance. (Round your answer to the nearest hundreth.)

Answer 1

since you are going to use a calculator any way to compute
\[\frac{\sum_i x_i^2-\overline{x}^2}{n-1}\] you might as well cheat
http://www.wolframalpha.com/input/?i=variance+15%2C+22%2C+36%2C+30%2C+38%2C+21

Answer 2

I still need to show work