Assume the ptobability that you will make a sale on any given telephone call is

Question

Assume the ptobability that you will make a sale on any given telephone call is .12 . Find probability that A) you make your first sale on fifth call B) make your sale on first, second, or third call C) do not make sale on first 3 calls Assume the ptobability that you will make a sale on any given telephone call is .12 . Find probability that A) you make your first sale on fifth call B) make your sale on first, second, or third call C) do not make sale on first 3 calls Find probability that A) you make your first sale on fifth call B) make your sale on first, second, or third call C) do not make sale on first 3 calls

Explanation / Answer

p = 0.12

A) P(first sale on fifth call) = (1 - 0.12)4 * 0.12 = 0.072

B) P(make sale on first, second or third call) = 1 - P(no sale first call) * P(no sale on 2nd call) * P(no sale on third call)

= 1 - (1 - 0.12)3

= 0.319

C) P(do not make sale on first 3 calls) = (1 - 0.12)3 = 0.681

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