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Let x1,\ x2,\....,\ xn values of variabl...

Let `x_1,\ x_2,\....,\ x_n` values of variable `X` and let `'a'` be non zero real number. Then prove that the variance of the observations `a x_1,\ a x_2, ... ,\ a x_n` is `a^2` Var `(X)` . Also, find their standard deviation.

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