If average (arithmetic mean) score of 9 students is 90, what is the median score?
1) The 5 smallest scores are 84, 83, 82, 81, and 80
2) The 4 largest scores are 89, 88, 86, and 85
==> If you modify the original condition and the question, and list the 9 numbers in the ascending order, you get 5th=median. Thus, according to con 1), you get 5th=median=84.
Therefore, the answer is A.
1) The 5 smallest scores are 84, 83, 82, 81, and 80
2) The 4 largest scores are 89, 88, 86, and 85
==> If you modify the original condition and the question, and list the 9 numbers in the ascending order, you get 5th=median. Thus, according to con 1), you get 5th=median=84.
Therefore, the answer is A.
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