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Math Help - Finding probability with only average?

  1. #1
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    Post Finding probability with only average?

    A certain type of plastic foil is four feet wide, and has, on average, two ‡flaws in a 100 ft roll. Find the probability that a 20 ft piece has two flaws.

    Help please?
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  2. #2
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    Quote Originally Posted by Intsecxtanx View Post
    A certain type of plastic foil is four feet wide, and has, on average, two ‡flaws in a 100 ft roll. Find the probability that a 20 ft piece has two flaws.

    Help please?
    Use the Poisson distribution with \mu = \frac{2}{100} \times 20 = \frac{2}{5}.
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