A study is trying to determine the effect that playing video games has on memory recall. The following table details the data collected.

Hours Spent Playing Video Games per Week Number of Teenagers

0 - 3.5 3

3.5 - 7.5 7

7.5 - 11.5 12

11.5 - 15.5 7

15.5 - 19.5 9

What is the best estimate, to the nearest tenth, for the number of hours spent playing video games per week?

Find Midpoints of Intervals:

Sum the frequencies times the midpoints:

Sum the frequencies:

Divide: