23.

There are 10 salespeople employed by Midtown Ford. The number of new cars sold last month by the respective salespeople were:

25

29

15

26

7

20

29

30

26

21

(a)	Compute the arithmetic mean. (Round your answer to 1 decimal place.)

(b)	Indicate whether it is a statistic or a parameter.

24. What is the following table called?

ages	number of ages
20 up to 30	16
30 up to 40	25
40 up to 50	51
50 up to 60	80
60 up to 70	20
70 up to 80	8

27.

The following is the number of minutes to commute from home to work for a group of automobile executives.

30	33	30	34	26	29	23	17	28	24	31	13	51
40	35	26	40	28	31	27	19	19	44	35	8

(a)	How many classes would you recommend?