The number of calls arriving at a telephone switchboard of a industry has an average of 120 calls per hour. a) What is the probability that between 1 and 5 calls arrive inclusive in a period of 1 minute? b) If 3 one-minute periods are observed, not overlapping, What is the probability that between 1 and 5 calls arrive inclusive in these periods?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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The number of calls arriving at a telephone switchboard of a industry has an average of 120
calls per hour.
a) What is the probability that between 1 and 5 calls arrive inclusive in a period of 1 minute?
b) If 3 one-minute periods are observed, not overlapping, What is the probability that between
1 and 5 calls arrive inclusive in these periods?
Transcribed Image Text:The number of calls arriving at a telephone switchboard of a industry has an average of 120 calls per hour. a) What is the probability that between 1 and 5 calls arrive inclusive in a period of 1 minute? b) If 3 one-minute periods are observed, not overlapping, What is the probability that between 1 and 5 calls arrive inclusive in these periods?
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