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The square of 22 is 484- 22 X22 ----- 44 44X ------ 484
v38
Long Multiplication 185 x22 3700 370 4070 The answer!!!!!
726 square feet
Suppose you have n observations {x1, x2, ... , xn} for a variable, X. Calculate m = (x1 + x2 + , ... , + xn)/n, the mean value. Calculate s2 = (x12 + x22 + , ... , + xn2)/n Then Variance = s2 - m2 = [mean of the squares] - [square of the mean] and the standard deviation = sqrt(Variance)