The function p(xy)is defined by p(xy)={(1+ax)(1+ay
The function p(xy)is defined by p(xy)={(1+ax)(1+ay)-a)e-x-y-axy with 00,y>0 and by p(xy)=0 elsewhere.Show that p(xy)is a probability density in two dimensions and that px(x)=e-x for x>0,=0 for x<0.
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