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Please help solve this question. Please also show full working for future practise. Thanks Consider a random vector X where X~Np (upx1, Epxp). (i) What

Please help solve this question. Please also show full working for future practise. Thanks

Consider a random vector X where X~Np (upx1, Epxp). (i) What is the distribution of X1 + 2X2 - 3X3? Give mean and variance of this distribution. Here X1, X2 and X3 are the first 3 elements of X

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