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The numbers of hours worked (per week) by 400 statistics students are shown below. Number of Hours Frequency 0 x < 10 20 10 x

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

Number of Hours Frequency
0 x < 10 20
10 x < 20 80
20 x < 30 200
30 x < 40 100

The class width for this distribution _____.

a. is 10
b. is 9
c. varies from class to class

d. is 40, which is the largest value minus the smallest value or 40 0 = 40

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