Find out whether each of the following processes {Xt} is weakly stationary or nonstationary. For the weakly stationary processes, find the mean and autocovariance functions. Consider in each question that {et}~ WN(0,02). 2 Xo = 0, and Xt = Xt-1 + et for t > 1. Hint: note here that et must be independent of Xt-1.

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