5.53 The number of telephone calls coming into the central switchboard of an office building averages four
Question:
5.53 The number of telephone calls coming into the central switchboard of an office building averages four per minute.
a Find the probability that no calls will arrive in a given 1-minute period.
b Find the probability that at least two calls will arrive in a given 1-minute period.
c Find the probability that at least two calls will arrive in a given 2-minute period.
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Related Book For 
Probability And Statistics For Engineers
ISBN: 9781133006909
5th Edition
Authors: Richard L Scheaffer, Madhuri Mulekar, James T McClave, Cecie Starr
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