(Solved):
Convolution formula) If the random variables \( X \) and \( Y \) are independ ...
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Convolution formula) If the random variables \( X \) and \( Y \) are independent and continuous with ensity functions \( f_{X} \) and \( f_{Y} \), then the density function of \( Z=X+Y \) is \[ f_{Z}(z)=\int_{-\infty}^{\infty} f_{X}(x) f_{Y}(z-x) d x \quad \text { for } z \in \mathbb{R} \]