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3. For n 2 2, let X have n-dimensional normal distribution MN(i, V). For any 1 3 m < n, let X1 denote the vector consisting of the last n - m coordinates of X < n, let 1 (a). Find the mean vector and the variance-covariance matrix of X1. (b). Show that Xi is a (n- m)-dimensional normal random vector.

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i (n-m 지 m eleu Xo 2H, is a veetun Xo 月 1136 oD 0 1Vm LX= lini叭 a mi varuak normat S

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