A manager of a popular retail store knows that the distribution of purchase amounts by its customers is approximately normal with a mean of $28 and a standard deviation of $9. a. What is the probability that a randomly selected customer will spend less than $15? [ Select] b. What is the probability that a randomly selected customer will spend $20 or more? [ Select] c. What is the probability that a randomly selected customer will spend $28 or more? [ Select ]

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