Find the indicated probabilities using the geometric distribution, the Poisson d

Question

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 sale on the first, second, or third call, and (c) do not make a sale on the first three calls

Explanation / Answer

a) probability that you make your first sale on 5th call =P( till first 4 call no sale* on fifth call there is a sale)

=(1-0.13)4*0.13 =0.0745

b)probability of making sale in first 3 calls =1-P( not making sale on first 3 calls) =1-(1-0.13)3 =0.3415

c)probability =(1-0.13)3 =0.6585

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