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?

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) (Show Source): You can put this solution on YOUR website!


Hi
Poisson distribtion:

 = .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.

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