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Let X be a discrete random variable taking values -4, 0, 12 with probabilities: p(-4)=1/2; p(0)=1/6;...

Let X be a discrete random variable taking values -4, 0, 12 with probabilities: p(-4)=1/2; p(0)=1/6; p(12)=1/3.

FindE(X), VarX and the standard deviation σx.

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