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

-Refer to Exhibit 2-1.The class width for this distribution
A)is 9
B)is 10
C)is 39,which is: the largest value minus the smallest value or 39 - 0 = 39
D)varies from class to class

Question

Exhibit 2-1
The numbers of hours worked (per week)by 400 statistics students are shown below.
 
-Refer to Exhibit 2-1.The class width for this distribution
A)is 9 
B)is 10 
C)is 39,which is: the largest value minus the smallest value or 39 - 0 = 39 
D)varies from class to class

Quizplus · Accepted Answer

To find the class width, we need to divide the range of the data by the number of classes. Here, the smallest value is 0 and the largest value is 390, so the range is 390. If we use 10 classes (because the data is already grouped in 10s), the class width would be 390/10 = 39. However, since none of the answer choices match this calculation, we can assume that the data is already grouped and the class width is simply 10 (the difference between each group of data). Therefore, the best choice is B) is 10.

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