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Variance Template Xi f(x;) Xi - x ( x 1 - x ) 2 ( x1 - x ) 2 f ( xi ) 1 2 3 0.18 -1.18 1.39 0.25 0.04 0.04 0.10 N W NH 0.46 -0.18 0.03 0.01 X 2 0.30 0.09 0.07 W 0.36 0.82 0.67 0.24 3 0.09 0.04 0.23 Weighted Avg 2.18 Var(x) 0.51 Standard Deviation 0.71 Covariance(xty) yi f( y:) yi - y ( vi y )2 ( vi - y ) ? f (vi) 1 0.43 -0.97 0.94 0.40 N 0.17 0.03 0.00 0.00 W N 3 0.40 1.03 1.06 0.42 Weighted Avg 1.97 Var(y ) 0.83 Standard Deviation 0.91 Si f(s;) Si - s (si - 5 ) 2 (si -s ) 2 f (si ) Weighted Avg Var(s ) Standard Deviation