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    Determining the sum of squares, variance, standard deviation

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    Please help me calculate the ss, variance and standard deviation for this.
    n=4 scores are 7, 4, 2, 1
    (do i figure the mean here 1st? 3.5?)
    standard deviation____

    Also if a population has a mean of 80 and standard deviation of 20 would the score of x=70 be considered extreme in the sample?
    If the standard were 5 would a score of x=70 be considered extreme?

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    Solution Preview

    1. mean=(7+4+2+1)/4=3.5
    Standard ...

    Solution Summary

    The solution gives detailed steps on determining the sum of squares, variance, standard deviation and extreme value in the sample.