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Math Help - Probability question please help

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    Probability question please help

    if i guess at five choice questions. each question has 5 anwsers to pick from. whats the probability that i l get three correct? tell me how u did it also thanks.
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    Re: Probability question please help

    probability problems go in the statistics forum
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    Re: Probability question please help

    Quote Originally Posted by Nasc0 View Post
    if i guess at five choice questions. each question has 5 anwsers to pick from. whats the probability that i l get three correct? tell me how u did it also thanks.

    If p is the probability of success and N is the number of trials then the probability of exactly k successes, where 0\le k\le N, is \binom{N}{k}p^k(1-p)^{N-k}.
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