The number of calls received by a car towing service averages 21.6 per day (per 24-hour period). After finding the mean number of calls per hour, find the probability that in a randomly selected hour the number of calls is 4.
A)0.01111
B)0.01000
C)0.01223
D)0.01389

Question

Quizplus · Accepted Answer

The mean number of calls per hour is 21.6/24 = 0.9. The probability of 4 calls in an hour is given by the Poisson distribution: P(X = 4) = (e^-0.9 * 0.9^4) / 4! = 0.01111.

The Number of Calls Received by a Car Towing Service