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Suppose that the probabilities of a customer purchasing 0, 1, or 2 books at a book store are 0.2, 0.3, and 0.5, respectively. What is

Suppose that the probabilities of a customer purchasing 0, 1, or 2 books at a book store are 0.2, 0.3, and 0.5, respectively. What is the standard deviation of this customer's book purchases? The standard deviation of the customer's book purchases is (Round to two decimal places as needed.)

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