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Suppose that the probabilities of a customer purchasing 0, 1. or 2 books at a book store are 0.3, 0.3, and 0.4, respectively. What is

Suppose that the probabilities of a customer purchasing 0, 1. or 2 books at a book store are 0.3, 0.3, and 0.4, respectively. What is the standard deviation of this customer's book purchases?

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