Compute Probabilities of a Poisson Random Variable

Multiple Choice

Compute Probabilities of a Poisson Random Variable
-The university police department must write, on average, five tickets per day to keep department revenues at budgeted levels. Suppose the number of tickets written per day follows a Poisson distribution with a mean of 9 tickets per day. Find the probability that less than six tickets are written on a randomly selected day from this distribution.

A) 0.115691
B) 0.206781
C) 0.884309
D) 0.793219