Exhibit 2-1
The numbers of hours worked (per week) by 400 statistics students are shown below.
-Refer to Exhibit 2-1. The cumulative percent frequency for the class of 30 - 39 is
A)100%
B)75%
C)50%
D)25%

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 percent frequency for the class of 30 - 39 is
A)100% 
B)75% 
C)50% 
D)25%

Quizplus · Accepted Answer

The cumulative percent frequency for the class of 30 - 39 is 100%. This is because the cumulative percent frequency is the sum of the percent frequencies of all the classes up to and including the given class. The percent frequency of the class of 30 - 39 is 25%, and the cumulative percent frequency of the class of 20 - 29 is 75%. Therefore, the cumulative percent frequency of the class of 30 - 39 is 100%.

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