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Random Variablesmedium
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If XXX is a discrete variable with P(X=k)=0.5P(X=k) = 0.5P(X=k)=0.5 for k=1k=1k=1 and P(X=k)=0.5P(X=k) = 0.5P(X=k)=0.5 for k=−1k=-1k=−1, what is Var(X)Var(X)Var(X)?