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Jointly Distributed Variables : Expressions for Density Function

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Suppose X and Y are continuous random variable, X and Y are independent and that x>0 and y>0. The pdf of X is Fx(X) and the pdf of Y is Fy(Y). Find the expressions for the density function of Z in terms of fx and fy, if...
a) Z=X/Y
b) Z=XY

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Expressions for Density Functions are investigated.

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