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Question from Poisson probability distribution

7. A sales form receives on the average of 3 calls per hour on its toll-free number. For any given hour, find the probability that it will receive a. At most 3 calls; b. At least 3 calls; and c. Five or more calls.


It's true that this is a question from Poisson's probability distribution. 

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This follows a poisson Distribution     
Average  =  3  
Atmost 3 Calls   =  p(x<=3)
p(x<=3)   0.6472
b) At least 3 calls:  =  1-P(x<=2)
p(x>=3) = 0.57681
c. Probability of 5 or more calls   = 1-P(x<=4)
p(x>=5) = 0.1847
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