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

Exhibit 2-1

The number 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



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


a. 100
b. 1
c. 30 - 39
d. 400


Answer: d. 400


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