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 $21 per month How much (or more) do the top 9% of customers spend? What is the probability that a customer will spend at least $21 per month? (Round to four decimal places as needed) How much do the top 9% of customers spend? $ (Round to the nearest cent as needed.)