SOLUTION: During the period of time that a local university takes phone-in registrations, calls come in at the rate of one every two minutes. What is the probability of three calls in fiv

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Question 464648: During the period of time that a local university takes phone-in registrations, calls come in at the rate of one every two minutes.
What is the probability of three calls in five minutes (to 4 decimals)
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Follows a Poisson distribution with alpha+=+5%2A%281%2F2%29+=+2.5
==> P%28+X+=+3+%29+=+e%5E%28-2.5%29%2A%282.5%5E3%2F3%21%29+=+0.2138, to four decimal places.