Suppose that head circumferences of adult men have a bell-shaped distribution with mean = 58 cm and standard deviation = 3 cm. (Use the Empirical Rule.) (a) What is the head circumference (in cm) such that only 2.5% of adult men have a smaller head circumference? X cm (b) What is the head circumference (in cm) such that only 2.5% of adult men have a larger head circumference? x cm (c) What is the head circumference (in cm) such that only 16% of adult men have a larger head circumference? EX cm Enter an exact number. Need Help? Read It