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QUESTION
Two variables, X and Y assume the values X1=2, X2=-5, X3=4, X4=-8 and Y1=-3, Y2=-8, Y3=10, Y4=6, respectively.
Two variables, X and Y assume the values X1=2, X2=-5, X3=4, X4=-8 and Y1=-3, Y2=-8, Y3=10, Y4=6, respectively. Calculate (a) ∑ X, (b) ∑ Y, (c) ∑ X2, (d) ∑ Y2, (e) ∑ XY (f) (∑ X)( ∑ Y), (g) ∑ XY2, and (h) ∑ (X+Y)(X-Y).
