# Question: The percentages of copper and iron in a certain kind

The percentages of copper and iron in a certain kind of ore are, respectively, X1 and X2. If the joint density of these two random variables is given by

Use the distribution function technique to find the probability density of Y = X1 + X2. Also find E(Y), the expected total percentage of copper and iron in the ore.

Use the distribution function technique to find the probability density of Y = X1 + X2. Also find E(Y), the expected total percentage of copper and iron in the ore.

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