Question: 4. The random variables $X$ and $y$ have a joint density function given by $$ f(x, y)=3 e^{-3 x} / x, text { for }

4. The random variables $X$ and $y$ have a joint density

4. The random variables $X$ and $y$ have a joint density function given by $$ f(x, y)=3 e^{-3 x} / x, \text { for } 0 \leq x

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