Suppose that motorists in the southeastern United states us a mean of 8.20 gallons of gasoline per week with a standard deviation of 0.47 gallons. Assume that gasoline consumption levels are approximately normally distributed. a. What percentage of southeastern drivers use more than 8.75 gallons of gasoline per week? b. What percentage of southeastern drivers use no more than 7.50 gallons of gasoline per week? c. What percentage of southeastern drivers use an amount of gasoline that differs from the mean by more than 0.25 gallons per week