Question

8. Sample data on employee age for a large auto parts manufacturer are as follows:
Employee Age Frequency
25-29 25
30-34 33
35-39 62
40-44 26
45-49 31
50-54 8

What is the mean age of the employees?

(Points: 5)
37
37.32
37.78
38.83

Answer 1

Take the weighted sum: 25*(25+29)/2 + 33*(30+34)/2 + ...

and divide by the sample size: 25 + 33 + ...