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The distribution of customers arriving at a bank is Poisson with a standard deviation of 2...

The distribution of customers arriving at a bank is Poisson with a standard deviation of 2 customers per 15-minutes. What is the probability that more than 3 customers arrive during 15 minutes?

a. 0.4335

b. 0.5665

c. 0.1804

d. 0.1954

math   Statistics-And-Probability   
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