Exhibit 2-1
The numbers of hours worked (per week) by 400 statistics students are shown below.
-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

Question

Exhibit 2-1
The numbers of hours worked (per week) by 400 statistics students are shown below. 
-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

Quizplus · Accepted Answer

Cumulative frequency is the sum of all frequencies up to a certain point. In this case, the cumulative frequency for the class of 20-29 is the sum of the frequencies for all classes up to and including 20-29. From the table, the sum of the frequencies for classes 0-9, 10-19 and 20-29 is 100 + 100 + 100 = 300. Therefore, the cumulative frequency for the class of 20-29 is 300.

Exhibit 2-1 The Numbers of Hours Worked (Per Week) by 400 Statistics