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  1. #1
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    probability

    5 coins are tossed, find probability that exactly 4 are heads.

    is there a way to do this without writing all of the combinations out? a short cut?
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  2. #2
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    Quote Originally Posted by algebra2 View Post
    5 coins are tossed, find probability that exactly 4 are heads.

    is there a way to do this without writing all of the combinations out? a short cut?
    Yes. Use the Binomial distribution: Binomial distribution - Wikipedia, the free encyclopedia
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  3. #3
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    Quote Originally Posted by algebra2 View Post
    5 coins are tossed, find probability that exactly 4 are heads.

    is there a way to do this without writing all of the combinations out? a short cut?

     <br />
{5 \choose 4} \left( \frac{1}{2} \right) ^{4} \left( \frac{1}{2} \right) ^{1}<br />
    Last edited by janvdl; May 26th 2008 at 08:16 PM. Reason: Stupid little bracket...
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