Question: ) In UC Davis Post Office, a postal clerk serves his customer(s) whose arrival is purely random and independent. The average number of customers' arrivals

) In UC Davis Post Office, a postal clerk serves his customer(s) whose arrival is purely random and independent. The average number of customers' arrivals is 1.2 in every 15 minutes. a) Find the probability that no customer comes to the Post Office in 15 minutes. First define the random variable of interest and determine its distribution

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