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January 25, 2015

January 25, 2015

Posted by **maria** on Tuesday, March 19, 2013 at 10:37pm.

a. What is the probability that three cars will arrive to use the diesel pump during a 1-hour period?

b. Suppose the owner needs to shut down the diesel pump for half an hour to make repairs. However, the owner hates to lose any business. What is the probability that no cars will arrive to use the diesel pump during a half-hour period?

c. Suppose five cars arrive during a 1-hour period to use the diesel pump. What is the probability of five or more cars arriving during a 1-hour period to use the diesel pump?

- statistics -
**MathGuru**, Wednesday, March 20, 2013 at 7:19pmPoisson distribution (m = mean):

P(x) = e^(-m) m^x / x!

Determining m:

3.2 cars every 2 hours

1/2(3.2) cars every hour = 1.6

1/4(3.2) cars every 1/2 hour = 0.8

For a):

x = 3

m = 1.6

Substitute into the formula and find the probability.

For b):

x = 0

m = 0.8

Substitute into the formula and find the probability.

For c):

x = 0,1,2,3,4

m = 1.6

Find the probabilities and add for a total. Take that value and subtract from 1.

I hope this will help get you started.

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