1
GATE ECE 1987
MCQ (Single Correct Answer)
+2
-0.6
The variance of a random variable X is $$\sigma _x^2\,.$$ Then the variance of - kx (where k is a positive constant ) is
A
$$\sigma _x^2\,$$
B
- k $$\sigma _x^2\,$$
C
k $$\sigma _x^2\,$$
D
$${k^2}\,\sigma _x^2\,$$
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