PART 1 • Descriptive Statistics
9. To determine a baseline of smoking activity, 30 smokers at a smoking-
cessation clinic were observed for a day and the number of cigarettes each
smoked was counted. Find the mean, median, and modal number of cigarettes
smoked
Х f X f Х f
43 1
38 2 33 3
42 1
37 1
32 2
41 0
36 6
31 1
40 1
35 5
30 1
39 2
34 4