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6.26 Let X and Y be jointly distributed random variables with joint pdf given by f(x,y) =2(x+y), forO 2X). 6.27 Refer to the joint density

6.26 Let X and Y be jointly distributed random variables with joint pdf given by f(x,y) =2(x+y), forO 2X). 6.27 Refer to the joint density in Exercise 6.26. (21) Find E(X). (b) Find E(X Y). (c) Find Cov(X, Y)

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