Question: A store has N clients per day, where the probability that N will be three is 0.1, that N will be two is 0.4, that

A store has N clients per day, where the probability that N will be

three is 0.1, that N will be two is 0.4, that N will be one is 0.3. The store never

gets more than three clients per day.

(a) Is N binomial? Poisson?

(b) Write the cumulative distribution function for N.

(c) What is the average number of clients per day?

(d) You want to study how many bags of milk each client buys. Half of them buy

two bags, a quarter buy 1 bag, and the rest buy none. Let X be the number of

bags of milk purchased on a given day. Are X and N independent?

(e) What is the probability that 5 bags will be purchased?

(f) What is the probability that there will be 3 clients and that 5 bags will be

purchased?

(g) What is the probability the 5 bags will be purchased given that there are three

clients?

(h) Find the probability function of X.

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