7/28/2020 Practice Final Exam
4. Approximate the mean of the frequency distribution for the The approximate mean age is
ages of the residents of a town.
(Round to one decimal place as needed.)
years.
Frequency
31
39
13
27
Age
0-9
10-19
20-29
30-39
40-49
50-59
60-69
70-79
80-89
24
51
30
11
9
5.
Why is the standard deviation used more frequently than the variance?