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Math Help - [SOLVED] Probability of an event occuring 2 out of 4 times

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    [SOLVED] Probability of an event occuring 2 out of 4 times

    i have an event that i have calculated the probability to be .0017

    what is the probability that this event happens exactly 2 out of 4 times? (assume independence)
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    Quote Originally Posted by jjs2168 View Post
    i have an event that i have calculated the probability to be .0017 what is the probability that this event happens exactly 2 out of 4 times? (assume independence)
    Exactly twice: {4 \choose 2} (.0017)^2(1-.0017)^2.
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