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    How Do You Calculate Marginal Density for fX(x) Given fX,Y(x,y)?

    Homework Statement Calculate the marginal density of fx (x). Fx,y (x,y) = double integral of 4x.e^(x+y) when 0<x<y, 0 otherwise. Homework Equations The Attempt at a Solution i set up the equation as fx (x) = integral from x up to infinity of 4x.e^(x+y) dy i get 4x...