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Exhibit 2-1 The numbers of hours worked (per week) by 400 statistics students are shown below. Number of Hours Frequency 0 x 10 20 10

Exhibit 2-1

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

Number of Hours Frequency

0x10 20

10x20 80

20x30 200

30x40 100

Refer to Exhibit 2-1. The number of students working less than 20 hours is _____.

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