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1. (25 points) A discrete-time random process is defined by X, = n's for n20, where s is an exponential random variable with parameter 1/5.

1. (25 points) 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 Xn (b) Is Xn a WSS random process ? (c) Let Yn = g (n) Xn, where g(n) is a deterministic function of n, find the mean and autocovariance function of Yn

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