"What is the average height of the n people in a certain group?"
(1) The average height of the n/3 tallest people is 6 feet 2.5 inches and the average height of the rest of the people is 5ft 10in.
(2) Sum of the heights of n people is 178ft 9 inches.
Correct answer is (A) Statement 1 is sufficient. I'm not sure I fully understand why?
Is it because since we know n must be an integer (since it is the number of people) and that statement 1 uses n/3, n must be either 1, 2, or 3? But since '1' would be 'person' (not the term 'people') and 3/3 equals 1, then n must be '2'? Thus, you can now calculate the average height.
(1) The average height of the n/3 tallest people is 6 feet 2.5 inches and the average height of the rest of the people is 5ft 10in.
(2) Sum of the heights of n people is 178ft 9 inches.
Correct answer is (A) Statement 1 is sufficient. I'm not sure I fully understand why?
Is it because since we know n must be an integer (since it is the number of people) and that statement 1 uses n/3, n must be either 1, 2, or 3? But since '1' would be 'person' (not the term 'people') and 3/3 equals 1, then n must be '2'? Thus, you can now calculate the average height.
