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Exercise 8.28 We have an urn with 25 yellow, 30 green and 40 red marbles. We...

Exercise 8.28 We have an urn with 25 yellow, 30 green and 40 red marbles. We take a sample of 10 without replacement and denote the number of yellow and green marbles in the sample by X and Y, respectively. Find E(X-Y).

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TOPIC:Hypergeometric distribution.

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