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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?)
ss____
variance____
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 Summary

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

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1. mean=(7+4+2+1)/4=3.5
SS=(7-3.5)^2+(4-3.5)^2+(2-3.5)^2+(1-3.5)^2=21
Variance=21/(4-1)=7
Standard ...

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