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Math Help - Help!! urgent need it on thursday (poisson)

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    Help!! urgent need it on thursday (poisson)

    An old car is never garaged at. On the morning following a wet night, the probability that the car does not start is 1/3. On the morning following a dry night, this probability is 1/25. The starting of a car each morning is independent of its performance on previous morning

    During a long summer drought there are 100 dry nights. Using a Poisson approximation, determine the probability that the car does not start on 5 or more of the 100 mornings.
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    Quote Originally Posted by whleow View Post
    An old car is never garaged at. On the morning following a wet night, the probability that the car does not start is 1/3. On the morning following a dry night, this probability is 1/25. The starting of a car each morning is independent of its performance on previous morning

    During a long summer drought there are 100 dry nights. Using a Poisson approximation, determine the probability that the car does not start on 5 or more of the 100 mornings.
    The average is (100)(1/25) = 4.

    So sub that into the Poisson formula and then calculate Pr(X > 4) = 1 - Pr(X < 5) ......
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