Joint pmf px1x2x12x218 x1x211122122 zero elsewhere., Ask an Expert

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Suppose X1 and X2 are random variables of the discrete type which have the joint pmf p(X1,X2)=(X1+2X2)/18, (x1,x2)=(1,1),(1,2),(2,1),(2,2), zero elsewhere. Determine the conditional mean and variance of X2, given X1=x1, for x1=1 or 2. Also compute E(3X1-2X2)

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