[See] Let X be a discrete random variable on the set 1,2,... with pdf f(x)=1/2^x . Find the cfd, E(X) and
Question: Let X be a discrete random variable on the set \(\left\{ 1,2,... \right\}\) with pdf \(f\left( x \right)=\frac{1}{{{2}^{x}}}\) . Find the cfd, E(X) and Var(X).
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