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OpenStudy (anonymous):
At a coffee shop, all customers buy a cup of coffee, and some buy a donut. Coffee sales are normally distributed with a mean of 450 and a standard deviation of 25. Donut sales are also normally distributed with a mean of 115 and a standard deviation of 15. If the shop closed on weekends (saturday and sunday) what is the probability of selling more than 550 donuts?
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