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f_X,Y(x,y)=xy   0<=x<=1, 0<=y<=2 f_X(x)=2x   0<=x<=1,     f_Y(y)=y/2 0<=y<=2 choose the all correct things. a. E[X]=1/2 b. E[XY]=8/9 c. COV[X,Y]=1...

f_X,Y(x,y)=xy   0<=x<=1, 0<=y<=2

f_X(x)=2x   0<=x<=1,     f_Y(y)=y/2 0<=y<=2 choose the all correct things.

a. E[X]=1/2

b. E[XY]=8/9

c. COV[X,Y]=1

d. correlation coefficiet =1

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