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Math Help - Struggeling with these statistic problems :(

  1. #1
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    Struggeling with these statistic problems :(

    1.)
    A class is given a surprise 10 question multiple choice quiz over material they were supposed to study. Since none of the students are prepared, they are forced to guess the answers. The probability that a guess on any question is right is 20%.
    Find the mean number of correct guesses for this 10 question quiz.


    2.)

    A class is given a surprise 10 question multiple choice quiz over material they were supposed to study. Since none of the students are prepared, they are forced to guess the answers. The probability that a guess on any question is right is 20%.
    Find the standard deviation of the number of correct guesses for this 10 question quiz.




    - any hints to solve this or way to set the problem up would be very helpful! thanks
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  2. #2
    Senior Member MaxJasper's Avatar
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    Re: Struggeling with these statistic problems :(

    n=10
    p=.20
    q=1-p
    mean=n*p
    sd=sqrt(n*p*q)
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