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Math Help - Four coins

  1. #1
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    Four coins

    If you were to toss four coins, what are the odds in favor of at least two landing heads up?
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  2. #2
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    What is the sample space of four coins being tossed:

    HHHH, HHHT, HHTH, HTHH, THHH. . .etc. Now of those how many have at least two H's in them?

    Or, if you have studied the binomial formula, you recognize this as a binomial distribution with four independent trials (the individual coins being tossed).
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  3. #3
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    Let X be the probability of tossing heads

    Then P(X\geq 2) = P(X= 2)+P(X= 3)+P(X= 4)
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