The following are the durations in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier.

Time (in Minutes)              Frequency      

15 but less than 25             0.08

25 but less than 35             0.24

35 but less than 45             0.09

45 but less than 55             0.35

55 but less than 65             0.15

65 but less than 75             0.08

75 or more                         0.01

a) If 100 calls were randomly sampled, how many calls lasted between 10 and 45

(b) If 1000 calls were randomly sampled, how many calls lasted 65 minutes or longer?

(c) Form the cumulative percentage distribution.

(d) Form the Ogive (cumulative percentage polygon).

(e) From the graph in (d), what percentage of calls lasted less than 77 minutes?

Answer rating: 100% (QA)

Required solution is given below Ans aThe relative frequency of calls lasted between 10 and 45 minu... View the full answer