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A company manufactures caclculators in batchers of 64 and there is a 5% rate of defects. Find the probability of getting exactly three defects in a batch

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    I think I remember a bit of this from when we were generating OC curves for a math modeling project last semester.

    In my notes there is the equation:
    P(d)= (n!/(d!(n-d)!))*(p^d)(1-p)^(n-d)

    It's assumed that the total lot is very large, so when you take n, the sample size, out doesn't change the remainder.

    P(d)= prop of observing exactly d
    number of defectives= d
    random sample= n
    p= fraction of defectives per lot.

    Hope this helps

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