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Let X be uniformly distributed with interval (0,10). Given X = x, such that Y is uniformly distributed with interval (0,x). Determine Cov(X,Y). The answer

Let X be uniformly distributed with interval (0,10). Given X = x, such that Y is uniformly distributed with interval (0,x). Determine Cov(X,Y).

The answer is 4,2, please explain why??

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