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Math Help - Help with finding the mean, variance and standard deviation

  1. #1
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    Help with finding the mean, variance and standard deviation

    Hi, I can't seem to fiqure out how to find the standard deviation of this problem. I don't know how to get it, and where does it come from. The problem is this. n = 76, p =0.8. I know how to get the mean which is to take 76*0.8, then I'm lost. Could one of you smart people help me pleeze.
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by mkcar View Post
    Hi, I can't seem to fiqure out how to find the standard deviation of this problem. I don't know how to get it, and where does it come from. The problem is this. n = 76, p =0.8. I know how to get the mean which is to take 76*0.8, then I'm lost. Could one of you smart people help me pleeze.
    It would help if you state the problem clearly.

    Presumably this is a question about the binomial distribution, with n trials with
    a probability of success on each trial of p. Then the mean number of success
    is np, and the standard deviation of the number of success is sqrt(np(1-p)).

    RonL
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  3. #3
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    I need to find the mean, variance and standard deviation of binomial distribution

    Hi, the question is put down as this n = 76, p =0.8. I know how to find the mean, but finding the variance needs me to find the answer of the standard deviation. Thant is what is hard for me. thank you
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