If X∼Exponential(λ)X \sim \text{Exponential}(\lambda)X∼Exponential(λ), what is the hazard rate function h(x)h(x)h(x)?
λ\lambdaλ
λe−λx\lambda e^{-\lambda x}λe−λx
1−e−λx1 - e^{-\lambda x}1−e−λx
1λ\frac{1}{\lambda}λ1