If X∼Exp(λ)X \sim \text{Exp}(\lambda)X∼Exp(λ), what is the hazard rate function h(x)h(x)h(x)?
λ\lambdaλ
λe−λx\lambda e^{-\lambda x}λe−λx
1/λ1/\lambda1/λ
λx\lambda xλx