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Points: 0 of 1 Historical data show that customers who download music from a popular Web service spend approximately $23 per month, with a

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Points: 0 of 1 Historical data show that customers who download music from a popular Web service spend approximately $23 per month, with a standard deviation of $3. Assume the spending follows the normal probability distribution. Find the probability that a customer will spend at least $21 per month. How much (or more) do the top 9% of customers spend? C

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