4. [-/12.5 Points] DETAILS WANEFMAC6 P.3.012. MY NOTES Find the expected value E(X), the variance Var(X) and the standard deviation o(X) for the density function. F(x) = 0.02e-0-02x on [0, +co) E(X) = Var(X) = o(X) =3. [-/12.5 Points] DETAILS WANEFMAC6 P.3.008. MY NOTES Find the expected value E(X), the variance Var(X) and the standard deviation o(X) for the density function. (Round your answers to four decimal places.) ((x) = _ on [1, e] X E(X) = Var(X) = o(X)