Question

The number of phone calls arriving at a switchboard each hour has been recorded, and the following frequency distribution has been developed. What is the approximate range of the number of phone calls?

Answer 1

The range of the number of phone calls can be found by subtracting the smallest value from the largest value in the distribution.

Step-by-step explanation:

The range of the number of phone calls can be found by subtracting the smallest value from the largest value in the distribution. In this case, the smallest value is the lower limit of the first class interval, and the largest value is the upper limit of the last class interval.

Number of Phone Calls Frequency

0-5 10

6-10 15

11-15 20

The range would be 15-0 = 15.