The number of telephone calls that arrive at a phone exchange is often modeled as a Poisson random variable. Assume that on the average there are 15 calls per hour. What is the probability that there are exactly 20 calls in one hour? O 0.9866 O 0.9647 O 0.0830 O 0.0134 O 0.0418 O O O
The number of telephone calls that arrive at a phone exchange is often modeled as a Poisson random variable. Assume that on the average there are 15 calls per hour. What is the probability that there are exactly 20 calls in one hour? O 0.9866 O 0.9647 O 0.0830 O 0.0134 O 0.0418 O O O
Chapter8: Sequences, Series,and Probability
Section8.7: Probability
Problem 11ECP: A manufacturer has determined that a machine averages one faulty unit for every 500 it produces....
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Transcribed Image Text:The number of telephone calls that arrive at a phone exchange is often modeled as a Poisson random variable. Assume that on the average there are 15 calls per
hour.
What is the probability that there are exactly 20 calls in one hour?
O 0.9866
O 0.9647
O 0.0830
O 0.0134
O 0.0418
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