   
   /**
   
-  Computes variance
+  Computes variance.
   
   http://en.wikipedia.org/wiki/Variance
   


  Formula

      s = sqrt( Σ(x - m) / (n - 1) )

  Where:



  Formula

      σ = sqrt( Σ( (x - m)^2 ) / n )

  Where:

