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Math Help - Find the probability distribution....

  1. #1
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    Find the probability distribution....

    Tv's are manufactured in lots of 200, 9 of these are tested and if none are faulty then the lot is accepted, find the probability distribution of the number of faulty televisions assuming there are 20 in a lot.

    Help :/ Is this the poisson distribution?
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  2. #2
    MHF Contributor matheagle's Avatar
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    Re: Find the probability distribution....

    Sounds like a hypergeo
    But it seems that you want the distribution of the number of bad tvs selected

    P(X=x)={{20 \choose x}{180\choose 9-x}\over{200\choose 9}}

    where x=0,1,...9.
    That took forever to type on a lame ipad with a lousy connection at an airport.
    Last edited by matheagle; January 7th 2012 at 09:57 PM.
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  3. #3
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    Re: Find the probability distribution....

    Quote Originally Posted by matheagle View Post
    Sounds like a hypergeo
    But it seems that you want the distribution of the number of bad tvs selected

    P(X=x)={{20 \choose x}{180\choose 9-x}\over{200\choose 9}}

    where x=0,1,...9.
    That took forever to type on a lame ipad with a lousy connection at an airport.
    Thank you.

    I really need to sharpen up on identifying which distribution it is. Any tips?
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  4. #4
    MHF Contributor matheagle's Avatar
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    Re: Find the probability distribution....

    you do know how to get to carnegie hall?
    practice practice practice
    Last edited by matheagle; January 8th 2012 at 08:19 AM.
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  5. #5
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    Re: Find the probability distribution....

    Quote Originally Posted by matheagle View Post
    you do know how to get to carnegie hall right?
    practice practice practice
    Haha, practice I must and practice I will.
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  6. #6
    Super Member ILikeSerena's Avatar
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    Re: Find the probability distribution....

    Quote Originally Posted by matheagle View Post
    That took forever to type on a lame ipad with a lousy connection at an airport.
    I'm guessing that at least it gave you something to do while waiting.

    Quote Originally Posted by matheagle View Post
    you do know how to get to carnegie hall right?
    practice practice practice
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