The product of the summation of x-variables and y-variables is determined as 168.
The summation of x variables is determined as follows;
∑X = 0 - 1 + 7 + 8 - 4 + 5 + 6 = 21
The summation of Y variables is determined as follows;
∑Y = 4 + 4 - 8 + 2 + 4 + 6 - 4 = 8
(ΣX)(ΣY) = 21 x 8 = 168
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