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The university library records the number of books checked out by each patron over the course of one day, with the following result: X P(X)

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The university library records the number of books checked out by each patron over the course of one day, with the following result: X P(X) 0.20 1 0.45 2 0.20 3 0.10 4 0.05 Table B6 What is the expected value of X? 1.35 O .8 O.15

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