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**Problem 17A**

Suppose that and are random losses jointly distributed according to the density function where and . Find the variance of the sum of the two losses.

**Problem 17B**

Suppose that and are random losses jointly distributed according to the density function where and . Find the variance of the sum of the two losses.

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**Answers**

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17b. did you mean f(x,y)=0.5e^(-0.5x)?

No. The problem is stated correctly.