Exhibit 3-1 The following data show the number of hours worked by 250 statistics students.

Number of Hours	Frequency
00 - 09	40
10 - 19	50
20 - 29	80
30 - 39	40

Answer:

7. Refer to Exhibit 3-1. The number of students working 29 hours or less

A. is 200 B. is 170 C. is 190 D. can not be determined without the original data E. None of the above answers is correct.

Answer:

8. Refer to Exhibit 3-1. The relative frequency of students working 29 hours or less

A. is .81 B. is .45 C. is .80 D. can not be determined from the information given E. None of the above answers is correct. Answer:

9. Refer to Exhibit 3-1. The cumulative relative frequency for the class of 10 - 19

A. is .90 B. is .25 C. is .43 D. can not be determined from the information given E. None of the above answers is correct. Answer: