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Let `x_1, x_2, ...... ,x_n` be values taken by a variable `Xa n dy_1, y_2,.......... ,y_n` be the values taken by a variable `Y` such that`y_i=a x_i+b ,i=1,2, ,ndot` Then, (a)`V a r(Y)=a^2V a r(X)` (b) `V a r(X)=a^2V a r(Y)` (c) `V a r(X)=V a r(X)+b` (d) none of these

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