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Average sales for an online textbook distributor were $71.75 per customer per purchase. Assume the...

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Average sales for an online textbook distributor were $71.75 per customer per purchase. Assume the sales are normally distributed. If the standard deviation of the amount spent on textbooks is $8.79, find these probabilities for a randomly selected customer of the online textbook distributor. The probability that a randomly selected customer spent more than $63 per purchase is

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