SOLUTION: A salesman from his records figures shows that probability of sales on first call is 0.7 . If he makes subsequent calls on the same person who had not yet bought the probability fa

Question 1161415: A salesman from his records figures shows that probability of sales on first call is 0.7 . If he makes subsequent calls on the same person who had not yet bought the probability falls to 0.1 . What is the probability of sales on three calls.
Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!

It's not clear what "probability of sales on three calls" means.

I interpreted it as a single sale, with no sale on either of the first two calls but a sale on the third call.

P(no sale on first call) = 1-0.7 = 0.3
P(no sale on second call) = 1-0.1 = 0.9
P(sale on third call) = 0.1

P(first sale on third call) = (0.3)(0.9)(0.1) = 0.027 = 2.7%

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