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Binomial distribution and probability problem

  1. Sep 24, 2008 #1
    1. The problem statement, all variables and given/known data

    A population has an average of 12 defects per 100 feet of wire sampled and inspected. What is the probability of finding 20 or fewer defects in a sample?


    2. Relevant equations

    I think im supposed to use the binomial distribution b(x;n,p)


    3. The attempt at a solution

    Where should i look to start?
     
    Last edited: Sep 25, 2008
  2. jcsd
  3. Sep 25, 2008 #2

    statdad

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    Homework Helper

    Re: Proability

    If you want to use the binomial distribution you need a sample size, do you not? You don't have one here.
    What distribution do you know of that refers to the mean number of items per (area, length, volume, time)?
     
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