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    Theoretical frequency for normal distribution

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    Consider a set of 50 measurements with mean of 50.2 and standard deviation 18.7 with the following observed frequencies.

    Interval Observed Frequencies
    39.99 or less 12
    40 - 59.99 18
    60 - 79.99 15
    80 and higher 5
    50

    It is desired to test whether these measurements came from a normal population. Calculate the theoretical frequency for the interval 60 - 79.99.

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    Solution Preview

    Mean= 50.2
    Standard deviation = 18.7
    x1= 79.99
    x2= 60
    z1=(x1- Mean)/standard deviation= 1.593 =(79.99-50.2)/18.7
    z2=(x2- ...

    Solution Summary

    The solution calculates theoretical frequency for normal distribution

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