SOLUTION: Customers arrive at Speedy Oil Change at the rate of 9 per hour. What is the probability that exactly seven customers arrive at Speedy’s in the next hour?

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Question 1177161: Customers arrive at Speedy Oil Change at the rate of 9 per hour. What is the probability that exactly seven customers arrive at Speedy’s in the next hour?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
Poisson distribtion:
p%28x%29+=+%28mu%5Ex%2Fx%21%29%2Ae%5E%28-mu%29
p%287%29+=+%289%5E7%2F7%21%29%2Ae%5E%28-9%29 = .1171

Or Using TI or similarly an inexpensive calculator like a Casio fx-115 ES plus 
P(7) = poissonpdf(mean, x-value) = poissonpdf(9, 7) = .1171

Wish You the Best in your Studies.