Question: The following data represent the distribution of the ages of employees within two different divisions of a pub­lishing company.

A B

Age of Employees (Years) Frequency Frequency

20—Under 30 8 15

30—Under 40 17 32

40—Under 50 11 20

50—Under 60 8 4

60—Under 70 2 0

For each of the two divisions (A and B), approximate the

(a) Mean.

(b) Standard deviation.

(c) On the basis of the results of (a) and (b), do you think there are differences in the age distribution between the two divisions? Explain.