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Random Variablesmedium
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Consider a random variable XXX with the probability density function f(x)=12e−∣x∣f(x) = \frac{1}{2}e^{-|x|}f(x)=21​e−∣x∣ for −∞<x<∞-\infty < x < \infty−∞<x<∞. What is the value of the characteristic function ϕX(t)=E[eitX]\phi_X(t) = E[e^{itX}]ϕX​(t)=E[eitX]?