Answer.....

A discrete-time random process is defined by X, = n's for n20, where s is an exponential random variable with parameter 1/5. (a) Find the mean and autocovariance functions of X, (b) Is Xn a WSS random process ? (c) Let Ym = g (n) X,, where gin) is a deterministic function of n, find the mean and autocovariance function of Y