Find the indicated probabilities using the geometric​ distribution, the Poisson​ distribution, or the binomial

distribution. Then determine if the events are unusual. If​ convenient, use the appropriate probability table or technology to find the probabilities.

Assume the probability that you will make a sale on any given telephone call is 0.15. Find the probability that you​ (a) make your first sale on the fifth​ call, (b) make your sale on the​ first, second, or third​ call, and​ (c) do not make a sale on the first three calls.

​(a) P(make your first sale on the fifth ​call)___?

​(b) P(make your sale on the​ first, second, or third ​call)___?

​

​(c) P(do not make a sale on the first three ​calls)____?

​

Which of the events are​ unusual? Select all that apply.

A.The event in part​ (a), “make your first sale on the fifth​ call”, is unusual.

B.The event in part​ (b), “make your sale on the​ first, second, or third​ call”, is unusual.

C.The event in part​ (c), “do not make a sale on the first three​ calls”, is unusual.

D.None of the events are unusual.

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