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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

  1. $\frac{6000}{\pi}\:,\:0$
  2. $\frac{6400}{\pi}\:,\:0$
  3. $\frac{6400}{\pi}\:,\:\frac{20}{(\pi\sqrt2)}$
  4. $\frac{6000}{\pi}\:,\:\frac{20}{(\pi\sqrt2)}$
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