Suppose that two students named gwyneth and josephine have, Ask an Expert

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Suppose that two students named Gwyneth and Josephine have a total of 20 CDs in their room, consisting of 5 blues CDs and 15 reggae CDs. Each of the students chooses 7 CDs at random (without replacement), with all choices equally likely. (Thus, altogether, 6 CDs remain unchosen.) Let X denote the number of blues CDs that Gwyneth selects. Let Y denote the number of blues that Josephine select. find thecovariance between x and y

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