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Math Help - Calculate the probability

  1. #1
    shelleeblue
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    Question Calculate the probability

    Calculate the probability of tossing exactly 2 heads in 5 coin tosses
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by shelleeblue View Post
    Calculate the probability of tossing exactly 2 heads in 5 coin tosses
    Binomial probability problem. Probability of success (a head) on a single toss
    is p=0.5. The probability of exactly n success in N trials is:

    P(n,N)=N!/[n! (N-n)!] p^n (1-p)^(N-n)

    so in this case:

    P(2,5)=5!/[2! 3!] 0.5^5 = 0.3125

    RonL
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