# Question: Based on annual driving of 15 000 miles and fuel efficiency

Based on annual driving of 15,000 miles and fuel efficiency of 20 mpg, a car in the United States uses, on average, 750 gallons of gasoline per year. If annual automobile fuel usage is normally distributed and if 29.12% of cars in the United States use less than 500 gallons of gasoline per year, what is the standard deviation?

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