Let x be a random variable with probability mass function

    ƒ(x) = k, |x|, if x = -2, 1, 3

    =0, otherwise

    where, K is a constant. Then the variance of x is :

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Let x be a random variable with probability mass function ƒ(x) = k, |x|, if x = -2, 1, 3 =0,
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