Question

X/Y 1 2 3 4 -1 0 0 0.1 0.2 0 0.1 0.1 0 0.1 1...

X/Y 1 2 3 4
-1 0 0 0.1 0.2
0 0.1 0.1 0 0.1
1 0.2 0 0.1 0.1

let the joint probability mass function of the discrete random variable X and Y give as above

Find

E(3x+1) and E(3x+4y)

cov( X,Y)

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