the average (arithmetic mean) of n numbers is equal to 3 1 the sum of the n numbers. If 2 1 the sum of the numbers is 15, what is the average of the n numbers?
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What is the average (arithmetic mean) height of the n people in a certain group?
(1) The average height of the n/3 tallest people in the group is 6 feet  inches, and the average height of the rest of the people in the group is 5 feet 10 inches.
(2) The sum of the heights of the n people is 178 feet 9 inches.
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