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    Frequency tables

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    1.
    Grade,
    x Freq Probability P(x) xP(x) (x-µ )sqP(x)
    9 3604
    10 3131
    11 2749
    12 2488

    Total µ= sigma sq=

    Determine the probability distribution of the randum varible x.
    What is the probability taht a randomly selected student is either in the 9th or 10th grade?
    What is the probability that a randomly selected student is in at most 11th grade?
    Find the mean and standard deviation of the random variable x.

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    Solution Preview

    ----------------------------------------------------------------------
    <br>Determine the probability distribution of the random varible x.
    <br>
    <br>Total number of students = 11972
    <br>P(x=9 ) = 3604/11972 = 0.30
    <br>
    <br>P(x=10) = 3131/11972 = 0.26
    <br>
    <br>P(x=11) = 2749/11972 = ...

    Solution Summary

    Grade,
    x Freq Probability P(x) xP(x) (x-µ )sqP(x)
    9 3604
    10 3131
    11 2749
    12 2488

    Total µ= sigma sq=

    Determine the probability distribution of the randum varible x.
    What is the probability taht a randomly selected student is either in the 9th or 10th grade?
    What is the probability that a randomly selected student is in at most 11th grade?
    Find the mean and standard deviation of the random variable x.

    $2.19

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