statistics
posted by Lindsay .
A sales firm receives an average of four calls per hour on its tollfree number. For any given hour, find the probability that it will receive exactly eight calls

statistics 
MathGuru
Try the Poisson Distribution.
Poisson distribution (m = mean):
P(x) = e^(m) m^x / x!
Values:
x = 8
m = 4
Substitute and calculate.
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