Let XXX have PDF f(x)=ce−∣x∣/σf(x) = ce^{-|x|/\sigma}f(x)=ce−∣x∣/σ for all x∈Rx \in \mathbb{R}x∈R. Find ccc in terms of σ\sigmaσ.
c=1σc = \frac{1}{\sigma}c=σ1
c=12σc = \frac{1}{2\sigma}c=2σ1
c=2σc = \frac{2}{\sigma}c=σ2
c=σ2c = \frac{\sigma}{2}c=2σ