Question: The Energy Information Administration reported that the mean retail price per gallon of regular grade gasoline was 52.81 (Energy Information Administration. November 2010). Suppose that the standard deviation was S.10 and that the retail price per gallon has a bell-shaped distribution.
a. What percentage of regular grade gasoline sold between 52.71 and $2.91 per gallon?
b. What percentage of regular grade gasoline sold between S271 and 53.01 per gallon?
c. What percentage of regular grade gasoline sold for more than $3.01 per gallon?