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Mathematics 8 Online
OpenStudy (anonymous):

An urn contains 6 red balls, 5 white balls, and 4 black balls. Four balls are drawn from the urn at random without replacement. For each red ball drawn, you win $6, and for each black ball drawn, you lose $9. Let X represent your net winnings. Compute E(X), your expected net winnings. E(X) = ?

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