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Math Help - Probabilty of failure

  1. #1
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    Probabilty of failure

    Hi,

    I am having some difficulty working out a solution to this question.

    Monitoring a car engine, the rate of occurrence of a fault is 1/15 per year.

    Calculate the probability of 0, 1 and 2 faults occurring over a 12.5 year period.

    I haven't got a clue how to approach this. I tried several methods but they are wrong.

    Thanks!!!!!! Any help would be much appreciated.
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  2. #2
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    Quote Originally Posted by jycrowman View Post
    Hi,

    I am having some difficulty working out a solution to this question.

    Monitoring a car engine, the rate of occurrence of a fault is 1/15 per year.

    Calculate the probability of 0, 1 and 2 faults occurring over a 12.5 year period.

    I haven't got a clue how to approach this. I tried several methods but they are wrong.

    Thanks!!!!!! Any help would be much appreciated.
    You're probably expected to use a Poisson model (the mean will be 12.5/15 = 5/6).
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