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Based on annual driving of 14,400 miles and fuel efficiency of 20 mpg, a car in...

Based on annual driving of 14,400 miles and fuel efficiency of 20 mpg, a car in the United States uses, on average, 720 gallons of gasoline per year. If annual automobile fuel usage is normally distributed, and if 31.56% of cars in the United States use less than 520 gallons of gasoline per year, what is the standard deviation?

(Round your answer to 3 decimal places.)

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