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Math Help - Probability

  1. #1
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    Probability

    Hello people, I need some help with this one, please.

    We throw r balls into n cells, randomly ( r >=n )
    What is the probability that at least one cell will stay empty ?

    thank you !
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  2. #2
    hpe
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    Quote Originally Posted by Wee G
    Hello people, I need some help with this one, please.

    We throw r balls into n cells, randomly ( r >=n )
    What is the probability that at least one cell will stay empty ?

    thank you !
    Funny that you should be asking this ... I made the attached file today that should help you. May I ask what kind of class this is for?
    Attached Files Attached Files
    Last edited by hpe; November 11th 2005 at 06:53 PM.
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  3. #3
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    the class is "Distribution Theory", part of a backelor degree in statistics
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  4. #4
    hpe
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    Quote Originally Posted by Wee G
    the class is "Distribution Theory", part of a backelor degree in statistics
    Essentially the number of empty bins has a hypergeometric distribution, if I'm not mistaken.
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