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Suppose I have a bag with 12 slips of paper in it. Some of the slips have a 2 on them, and the rest have

Suppose I have a bag with 12 slips of paper in it. Some of the slips have a 2 on them, and the rest have a 7 on them. If the expected value of the number shown on a slip randomly drawn from the bag is 3.25, then how many slips have a 2?

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