### What is the probability

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##### Reference no: EM1318010

Finding the Probability from the given data

In a shop there are 20 customers, 18 of whom will make a purchase. If three customers are selected, one at a time, at random, what is the probability that all will make a purchase?

Find the probability using Normal Distribution.

Suppose that the lifetimes of a certain light bulb are normally distributed with Mean = 1200 hours and Standard deviation = 160. Find the probability that a light bulb will burn out in less than 1000 hours.

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