Let X1, . . . , Xn be random variables with Var(Xi ) = 2
Chapter , Problem 30(choose chapter or problem)
Let \(X_1, \ldots, X_n\) be random variables with \(\operatorname{Var}\left(X_i\right)=\sigma^2\) and \(\operatorname{Cov}\left(X_i, X_j\right)=\) \(\rho \sigma^2\), for \(i \neq j\). Use matrix methods to find \(\operatorname{Var}(\bar{X})\).
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