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Let X be the discrete random variable. T...

Let `X` be the discrete random variable. Then the variance of `X` is (a). `E(X^2)` (b). `E(X^2)+(E(X))^2` (c). `E(X^2)-(E(X))^2` (d). `sqrt(E(X^2)-(E(X))^2)`

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