Question: A random process is defined as x [ n ] = 1 2 ( a [ n ] + a [ n - 1 ]

A random process is defined as x[n]=12(a[n]+a[n-1])
where a[n] is an i.i.d. sequence of U(-1,1) variables.
(a) Compute the mean and the variance of x[n].
(b) Specify the first-order PDF of x[n].
(c) Determine the autocorrelation function of x[n].

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