Sample variance (dispersion)

s^2 = ( (x1 - x_v)^2+ (x2 - x_v)^2 + (x3 - x_v)^2 ) / (n-1)
s^2 - sample variance (dispersion)
x1, x2, x3 ... - sample values
x_v - sample mean (average)
n - number of sample elements
Find   It is known that:
      =   
Calculate 's'

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