6. A sample of cellular phone calls among college students was taken at St. Francis College. The data is summarized in the table below.

(15 pts).

Time of Call Relative Cumulative

(in minutes) Frequency Frequency

0 but less than 6 .40 .40

6 but less than 12 .30 ?

12 but less than 18 .15 .85

18 but less than 24 .08 ?

24 but less than 30 ? .98

30 or more .02 ?

a. Complete the Relative Frequency and Cumulative Frequency charts.

b. If 2,000 calls were randomly sampled, how many calls lasted between 12 and 24 minutes?