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Math Help - Probability Question

  1. #1
    Member ~berserk's Avatar
    Joined
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    Probability Question

    A fair coin is tossed 3 times. Find the probability of getting:
    a.)exactly two heads
    b.)exactly three heads
    c.)exactly one tail

    I know i have to use the formula nCr p^r q^(n-r)
    for part a.) n=3
    r=2
    p=?
    q=?

    I don't know how to find p and q
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  2. #2
    Member
    Joined
    May 2008
    Posts
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    Quote Originally Posted by ~berserk View Post
    A fair coin is tossed 3 times. Find the probability of getting:
    a.)exactly two heads
    b.)exactly three heads
    c.)exactly one tail

    I know i have to use the formula nCr p^r q^(n-r)
    for part a.) n=3
    r=2
    p=?
    q=?

    I don't know how to find p and q
    p = 0.5 and q = 1-p, so in this case they're both 0.5
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