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    Graduate Expected Value, Expected Variance,covariance

    Can someone help me with this problem? The joint probability mass function of X and Y, p(i,j)=P{X=i,Y=j}, is given as follows p(-1,-2)=1/9, p(-1,-1)=1/18, p(-1,0)=1/12, p(-1,1)=0, p(0,-2)=1/12, p(0,-1)=1/9, p(0,0)=0, p(0,1)=1/8, p(1,-2)=0...