Suppose that the mean retail price per gallon of regular grade gasoline in the United States is $3.47 with a standard deviation of $0.20 and that the retail price per gallon has a bell-shaped distribution. (a) What percentage of regular grade gasoline sold between $3.27 and $3.67 per gallon?  % (b) What percentage of regular grade gasoline sold between $3.27 and $3.87 per gallon?  % (c) What percentage of regular grade gasoline sold for more than $3.87 per gallon?

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