The power spectral density of a real process $X(t)$ for positive frequencies is shown below. The values of $E[X^2(t)]$ and $ \mid E[X(t)] \mid$, respectively, are
- $\frac{6000}{\pi}\:,\:0$
- $\frac{6400}{\pi}\:,\:0$
- $\frac{6400}{\pi}\:,\:\frac{20}{(\pi\sqrt2)}$
- $\frac{6000}{\pi}\:,\:\frac{20}{(\pi\sqrt2)}$