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