find Indicated probability using geometric distribution Poisson distribution or

Question

find Indicated probability using geometric distribution Poisson distribution or the binomial distribution then determine if events are unusual assume probability that you will make a sale on any given telephone call is 0.12,find probability that you will make your first sale on fifth call,b) make your sale on first, second,third call, c) do not make sale on the first 3 calls

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Explanation / Answer

here as probabitly on a given telephone call =0.12

a) from geometric distribution,  probability that you will make your first sale on fifth call =P(in first 4 days no sale, and fifth day sale happens) =(1-0.12)4(0.12) =0.0720

b)probability to make your sale on first, second or third call =P(sale on first call+no sale on first*sale on second+no sale on first 2 *sale on third call) =0.12+(1-0.12)*0.12+(1-0.12)*(1-0.12)*0.12 =0.3185

c) as sale on an indivdual day is an independent event;

hence probabilty to no sale on first 3 calls =(1-0.12)3 =0.6815

d) options are not clear.,

kindly revert them in comment column so that i can answer them

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