申論題內容
5. (20%) Let x = (X1, X2, X3)' have a trivariate normal distribution with means 6, 4, and 2 and variance 16, 25, and 64, and with cou(X1, X2) = 6 and coc(X1,X3) = 4 and cou(X2,X3)=5. Let Y1=2X1+3X2+ X3 +2 and Y2 =4X1+ X3 +3. What is the joint distribution of y = (Y1, Y2)'?
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