Please solve and answer b) and c).

Suppose that the mean retail price per gallon of regular grade gasoline in the United States is $3.49 with a standard deviation of $0.10 and that the retail price per gallon has a bell-shaped distribution. a What percentage of regular grade gasoline sold between $3.39 and $3.50 per gallon? (b) What percentage of regular grade gasoline sold between $3.39 and $3.69 per gallon? X c) What percentage of regular grade gasoline sold for more than $3.69 per gallon? 97.5 X