pose that mean retail price per gallon of regular grade gasoline is $3.49 with a standard deviation of $0.10 and that the retail price per gallon has a bell- ed distribution. E: Please use empirical rule approximations for this problem. hat percentage of regular grade gasoline sells for between $3.29 and $3.69 per gallon (to 1 decimal)? % What percentage of regular grade gasoline sells for between $3.29 and $3.59 per gallon (to 1 decimal)? % That percentage of regular amado ancoline calls for m $2.60