Question: 6 - If x 1 , x 2 , and x 3 have the means 4 , 9 , and 3 the variances 3 ,

6- If x1,x2, and x3 have the means 4,9, and 3 the variances 3,7, and 5, and cov(x1,x2)=1, cov(x1,x3)=-2,cov(x2,x3)=-3, find the mean and the variance of
a)Y=2x1-3x2+4x3;
b)Z=x1+2x2-3x3.
c) Find cov(Y,Z).
6- If x1,x2, and x3 have the means 4,9, and 3

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