The following are the duration in minutes of a samle of long distance phone calls made within
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Question:
The following are the duration in minutes of a samle of long distance phone calls made 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……………………….0.24
10 but less than 15……………………...0.07
15 but less than 20……………………..0.08
20 but less than 25……………………..0.15
25 but less than 30……………………..0.08
30 or more……………………………...0.01
1. If 100 calls were randomly sampled, how many calls lasted under 50 minutes?
2.If 1000 calls were randomly sampled, how many calls lasted 15 minutes or longer?
3. Form the cumulative percentage distribution.
Related Book For
Probability and Statistical Inference
ISBN: 978-0321923271
9th edition
Authors: Robert V. Hogg, Elliot Tanis, Dale Zimmerman
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