Ononot — Let X have PDF f(x) = \frac{1}{2}e^{-|x|} for all x \in \mat

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Random Variableshard

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Let $X$ have PDF $f(x) = \frac{1}{2}e^{-|x|}$ for all $x \in \mathbb{R}$ . What is $Var(X)$ ?