The number of traffic accidents per day on a certain section of highway is thought to be Poisson distributed with a mean equal 2.19. Based on this, how many traffic accidents should be expected during a week long period?
a. 15.33
b. 10.95
c. approximately 10.36
d. approximately 12.21
e. none of these

If the standard deviation for a Poisson distribution is known to be 3.60, the expected value of that Poisson distribution is:
a. approximately 1.90
b. 3.60
c. 7.2
d. 8.28
e. 12.96

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  1. The mean is the expected value. An important feature to remember about the Poisson distribution is that the standard deviation is the square root of the mean.

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