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The number of gallons of paint that Home Depot sells in a given day is normally...

The number of gallons of paint that Home Depot sells in a given day is normally distributed with a mean of 160 gallons and a standard deviation of 35 gallons ( I really that the distribution is probably different for weekends compared to weekdays, but just assume everyday has the distribution). In a sample of 80 days, what is the probability that the average number of gallons sold will be 165 or less?

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