Posted by **Hoon** on Thursday, October 14, 2010 at 12:14am.

Assume that showing a car is a Bernoulli trial, and each time she shows a car,

there is a probability of 0.25 that the customer will buy the car. The

saleswoman has a goal of selling at least one car a week.

How many cars must she show so that the probability of her reaching her goal

is at least 0.99?

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