$($a$)$ A WSS random process X$($t$)$ has an autocorrelation function given below. Find the power

spectral density of this signal.

RXX $($ $)$

$10\mathrm{.}500\mathrm{.}51$

$4$

$1$

$($b$)$ For the random process in $($a$)$ find the average power.

$($c$)$ For the random process in $($a$)$ find E$[$X$(0\mathrm{.}1)$X$(0\mathrm{.}3)].$