assume the probability that you will make a sale on any given telephone call is

Question

assume the probability that you will make a sale on any given telephone call is 0.17. Fund the probability that you (a) make you 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 3 calls assume the probability that you will make a sale on any given telephone call is 0.17. Fund the probability that you (a) make you 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 3 calls assume the probability that you will make a sale on any given telephone call is 0.17. Fund the probability that you (a) make you 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 3 calls

Explanation / Answer

p = probability of success in a single trial = 0.17

q = 1 - p = 0.83

(a) First sale on 5th call = 1st failure X 2nd failure X 3rd failue X 4th failure X 5th success = q4 p

                                   = (0.83)4 (0.17) = 0.4746 X 0.17 = 0.0807

(b) 1st success X 2nd success X 3rd success = p3 = (0.17)3 = 0.0049

(c) 1st failure X 2nd failure X 3rd failre = q3 = (0.83)3 = 0.5718

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