In a cumulative relative frequency distribution the

23. In a cumulative relative frequency distribution, the last class will have a
cumulative relative frequency equal to
a. one
b. zero
c. 100
d. None of the other answers are correct.
ANSWER: a
24. In a cumulative percent frequency distribution, the last class will have a
cumulative percent frequency equal to
25. The difference between the lower class limits of adjacent classes provides the
Exhibit 2-1
The numbers of hours worked (per week) by 400 statistics students are shown below.
Number of hours Frequency
0  9
20
10  19
80
20  29
200
30  39
100
26. Refer to Exhibit 2-1. The class width for this distribution

c. is 39, which is: the largest value minus the smallest value or 39  0 = 39
d. varies from class to class
ANSWER: b
27. Refer to Exhibit 2-1. The midpoint of the last class is
28. Refer to Exhibit 2-1. The number of students working 19 hours or less
29. Refer to Exhibit 2-1. The relative frequency of students working 9 hours or less
30. Refer to Exhibit 2-1. The cumulative relative frequency for the class of 20  29
a. is 300
b. is 0.25
c. is 0.75
d. is 0.5
ANSWER: c
31. Refer to Exhibit 2-1. The percentage of students working 10  19 hours is
32. Refer to Exhibit 2-1. The percentage of students working 19 hours or less is
33. Refer to Exhibit 2-1. The cumulative percent frequency for the class of 30 
is
39

34. Refer to Exhibit 2-1. The cumulative frequency for the class of 20  29
a. is 200
b. is 300
c. is 0.75
d. is 0.50
ANSWER: b
35. Refer to Exhibit 2-1. If a cumulative frequency distribution is developed for the
above data, the last class will have a cumulative frequency of
36. Refer to Exhibit 2-1. The percentage of students who work at least 10 hours per
week is
Exhibit 2-2
Information on the type of industry is provided for a sample of 50 Fortune 500
companies.
Industry Type Frequency
Banking 7
Consumer Products 15
Electronics 10
Retail 18
37. Refer to Exhibit 2-2. The number of industries that are classified as retail is