Question

Variance of the sum of two statistically independent random variables XX and YY, σX+Y2\sigma_{X+Y}^2, is

MCQ

σX2+σY2\sigma_X^2 + \sigma_Y^2.

σX2+σY2+2σXY\sigma_X^2 + \sigma_Y^2 + 2\sigma_{XY}.

σX2+σY2+σXY\sigma_X^2 + \sigma_Y^2 + \sigma_{XY}.

σX2+σY22σXY\sigma_X^2 + \sigma_Y^2 - 2\sigma_{XY}.

Solutions
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