The manager of the local grocery store has determined that, on the average, 4 customers use the service desk every half-hour. Assume that the number of customers using the service desk has a Poisson distribution.
-What is the probability that during a randomly selected half-hour period no more than 2 customers use the service desk?
A)2381
B)1465
C)7619
D)8535
E)0916

Question

Quizplus · Accepted Answer

The probability that during a randomly selected half-hour period no more than 2 customers use the service desk is given by the Poisson distribution with parameter λ = 4:P(X ≤ 2) = P(X = 0) + P(X = 1) + P(X = 2) = e^(-4) + 4e^(-4) + 8e^(-4)/2! = 0.2381Therefore, the correct choice is A.

The Manager of the Local Grocery Store Has Determined That