ProbabilityHard
Question
At a telephone enquiry system the number of phone cells regarding relevant enquiry follow Poisson distribution with an average of 5 phone calls during 10-minute time intervals. The probability that there is at the most one phone call during a 10-minute time period is
Options
A.
B.
C.
D.
Solution
P(X = r) = 
P(X ≤ 1) = P (X = 0) + P (X = 1)
= e-5 + 5 × e-5 =
P(X ≤ 1) = P (X = 0) + P (X = 1)
= e-5 + 5 × e-5 =
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