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Historical data show that customers who download music from a popular Web service spend approximately $24 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 $20 per month. How much (or more) do the top 11% of customers spend? rry What is the probability that a customer will spend at least $20 per month? (Round to four decimal places as needed.) How much do the top 11% of customers spend? $(Round to the nearest cent as needed.) ice id ic