Suppose that mean retail price per gallon of regular grade gasoline is $3.54 with a standard deviation of $0.10 and that the retail price per gallon has a bell-shaped distribution. NOTE: Please use empirical rule approximations for this problem. a. What percentage of regular grade gasoline sells for between $3.44  and $ 3.64 per gallon (to 1  decimal)?   b. What percentage of regular grade gasoline sells for between $ 3.44 and $ 3.74 per gallon (to 1 decimal)?   c. What percentage of regular grade gasoline sells for more than $3.74  per gallon (to  1 decimal)?

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