Let w₁, W2,..., wt be independent random variables from a normal distribution with mean 0 and variance o2. Suppose find the followings. (a) E(xt). (b) Var(xt). (c) Cov(wt, wt-1). (d) Cov(xt, xt-1). xt = W₁ + W₂ + + Wtr

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