4.3.11 EQuestion Help | 0 Find the indicated probabilities using the geometric d

Question

4.3.11 EQuestion Help | 0 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 0.19. 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. (a) P(make your first sale on the fifth call) = 0 (Round to three decimal places as needed.)

Explanation / Answer

a) P(First sale on fifth call)

= P(No sale in first four calls)*P(Sale in fifth call)

= (0.81)4(0.19)

= 0.082

b) P(Sale on first second or third call)

= 0.19 + 0.81*0.19 + 0.812*0.19

= 0.469

c) P(Do not make sale on first three calls)

= 1 - 0.469

= 0.531

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