Compute standard deviation.
function StdDev(SumOfSquares: double; Sum: double; Averages: integer): double; overload;
Returns standard deviation according to the formula:
File n*Sum(x^2) - Sum(x)^2
StdDev = ( ------------------------- )^0.5
n*(n-1)
n... number of averages taken
Sum(x^2)... sum of squares of samples
Sum(x)... sum of samples|
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