4. (10 marks) Consider the following joint pmf f(x,y) which is defined via: 1 1 f(1,0) = f(1,1) = f(x,y) = 0 otherwise.
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5. (20 marks) Consider the pdf f(r,y) = { C(x + 2y) IE (0,2), y € (0,1), else. (a) (10 marks) Find the constant C. (b) (10 marks) Find fx (1) - the marginal pdf of X.