probability

what is the probability of getting a head when tossing 4 coins simultaneously

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  1. just one head? Means one head, three tails.

    Pr= .5^4

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    bobpursley
  2. I read that as a binomial distribution.
    so
    C(4,1) (1/2)^1 (1/2)^3
    = 4(1/2)^4
    = 1/4

    or

    there are 2^4 or 16 cases
    your event could be
    HTTT
    THTT
    TTHT
    TTTH, or 4 possibilities
    prob(exactly one head) = 4/16 = 1/4

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  3. I agree on 1/4, the answer I posted is of getting a HTTT, but there are four ways of getting a H (first, second, third, ..), or Pr=4/16 or 1/4

    Thanks for checking Reiny.

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    bobpursley

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