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} 0

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

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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