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Method and examples

Find Population Variance, Standard deviation and coefficient of variation for ungrouped data 
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Standard deviation `sigma` formula 
 Auto Select method
 Method1 : `sigma = sqrt((sum x^2  (sum x)^2/n)/n)`
 Method2 : `sigma = sqrt((sum (x  bar x)^2)/n)`
Or `sigma = sqrt((sum dx^2  (sum dx)^2/n)/n)`


 `85,96,76,108,85,80,100,85,70,95`
 `3,13,11,15,5,4,2`
 `3,23,13,11,15,5,4,2`
 `69,66,67,69,64,63,65,68,72`
 `4,14,12,16,6,3,1,2,3`
 `73,70,71,73,68,67,69,72,76,71`
 `10,50,30,20,10,20,70,30`



Solution 
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