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the head circumferences of adult males have a bell-shaped distribution with the mean= 65cm and standard deviation =2cm.

a. what is the head circumference such that only 2.5% of adult males have a smaller head circumference?

b. what is the head circumference such that only 2.5% of adult males have a larger head circumference?

c. what is the head circumference such that only 16% of adult males have a larger head circumference?

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