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Math Help - probability problem

  1. #1
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    probability problem

    Hi there a freind posed me this question unfortunatly probability isn't my strongest area:

    There area total of 75 balls of which 15 are red.

    If 28 balls are selected at random what s the probability that all the red balls are chosen?

    Any help would be appreciated.
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  2. #2
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    Quote Originally Posted by NeilT View Post
    Hi there a freind posed me this question unfortunatly probability isn't my strongest area:

    There area total of 75 balls of which 15 are red.

    If 28 balls are selected at random what s the probability that all the red balls are chosen?

    Any help would be appreciated.
    A good opportunity then for you to work on a weakness. Review the Hypergeometric Distibution.
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  3. #3
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    thanks! i've calculated an approximate answer of 0.0156 (3 sig figs)

    have to admit i'm surprised it's as small.
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