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 0.13. Find the probability that you​ (a) make your first sale on the fifth​ call, (b) make your first sale on the​ first, second, or third​ call, and​ (c) do not make a sale on the first three calls.

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Part 1

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



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​(Round to three decimal places as​ needed.)