The following are the durations in minutes of a sample of long-distance phone calls within the continental
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Question:
The following are the durations in minutes of a sample of long-distance phone calls within the continental United States reported by one long-distance carrier.
Time (in minutes) | Relative Frequency |
0 but less than 5 | 0.37 |
5 but less than 10 | 0.22 |
10 but less than 15 | 0.15 |
15 but less than 20 | 0.10 |
20 but less than 25 | 0.07 |
25 but less than 30} 0.07 | |
30 or more | 0.02 |
i) What is the width of each class?
a. 1 minute
b. 2%
c. 5 minutes
d. 100%
ii) What is the cumulative relative frequency for the percentage of calls that lasted under 10 minutes?
a. 0.10
b. 0.76
c. 0.59
d. 0.84
Related Book For
Probability and Statistical Inference
ISBN: 978-0321923271
9th edition
Authors: Robert V. Hogg, Elliot Tanis, Dale Zimmerman
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