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A telephone exchange receives, on average, 5 calls per minute. Find the probability (i) that in a 1-minute period no calls are received; (ii) that in a 2-minute period fewer than 4 calls are received; (iii) that in a 20-minute period no more than 102 calls are received;

A telephone exchange receives, on average, 5 calls per minute. Find the probability (i) that in a 1-minute period no calls are received; (ii) that in a 2-minute period fewer than 4 calls are received; (iii) that in a 20-minute period no more than 102 calls are received;

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section11.8: Probabilities Of Disjoint And Overlapping Events
Problem 2C
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Statistics and Probability
A telephone exchange receives, on average, 5 calls per minute. Find the probability (i) that in a 1-minute period no calls are received; (ii) that in a 2-minute period fewer than 4 calls are received; (iii) that in a 20-minute period no more than 102 calls are received; (iv) that out of five separate 1-minute periods there are exactly four in which 2 or more calls are received.
Transcribed Image Text:A telephone exchange receives, on average, 5 calls per minute. Find the probability (i) that in a 1-minute period no calls are received; (ii) that in a 2-minute period fewer than 4 calls are received; (iii) that in a 20-minute period no more than 102 calls are received; (iv) that out of five separate 1-minute periods there are exactly four in which 2 or more calls are received.
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