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Math Help - Math Contest Problem 3

  1. #1
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    Math Contest Problem 3

    This problem is from the 2002 Luzerne County Math Contest:
    Assume a person flips five fair coins. What is the probability of obtaining at least 4 heads?
    Is there any way to do this problem without listing all the possibilites? Thanks in advance!
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  2. #2
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    Quote Originally Posted by eric1299171 View Post
    This problem is from the 2002 Luzerne County Math Contest:
    Assume a person flips five fair coins. What is the probability of obtaining at least 4 heads?
    Is there any way to do this problem without listing all the possibilites? Thanks in advance!
    The number of heads in five flips is a binomial random variable X \sim B(5,0.5), and you are asked to find:

    p=Pr(X=5)+Pr(X=4)

    CB
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  3. #3
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    Thanks for the reply! I looked up the formula in a probability book I had. =)
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