Find the Expected Value and Variance for the Random Variable $f ( x ) = e ^ { x }$

Short Answer

Find the expected value and variance for the random variable whose probability density function is $f ( x ) = e ^ { x }$ $x \leq 0$ (You may use the fact that $\lim _ { b \rightarrow \infty }$ $b e^{b}$ = 0 .)Enter just two integers (unlabeled) in the order E(X), Var(X) separated by a comma.