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Math Help - Probability Distrabution

  1. #1
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    Probability Distrabution

    Find the probability of getting at least three defective items in a batch of ten items if the overall percentage of defects is 40%.

    Ok, so this is my question "at least 3" so i am using my TI-84 plus clac. and i make a table by using binompdf(n,p) and putting it in list 1.

    It gives me this
    0-.00605
    1-.04031
    2-.12093
    3-.21499
    4-.25082
    5-.20066
    6-.11148
    7-.04247
    8-.01062
    9-.000157
    10-1E-4

    so if i want to know the probablity of at least 3 what do i do with these numbers?
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  2. #2
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    p(at least 3) = p(3) + p(4) + p(5) + ... -- Jut add them up.

    Of course, it is often easier to think about what you don't want.

    p(at least 3) = 1 - p(less than 3) = 1 - (p(0) + p(1) + p(2))
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  3. #3
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    oh duhhh! haha thanks
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