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The numbers of hours worked on homework (per week) by 400 statistics students are shown below. Number of hours Frequency 0 -4 20 5 -

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

Number of hours	Frequency
0 -4	20
5 - 9	80
10 - 14	200
15 - 19	100

The class width used in this frequency distribution is

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