作者lovekyoko (我在Tamap 天气晴)
看板juniorhigh
标题[问题] 请问一题数学
时间Fri Oct 9 21:58:47 2009
188.
Last month 15 homes were sold in Town X. The average (arithmetic mean) sale
price of the homes was $150,000 and the median sale price was $130,000.
Which of the following statements must be true?
I.At least one of the homes was sold for more than 165,000
II.At least one of the homes was sold for more than 130,000 and less than
150,000
III. At least one of the homes was sold for less than 130,000
(A)I only
(B)II only
(C)III only
(D)I and II
(E)I and III
答案是A
请问这题该怎麽想比较快 应该不用代数字吧
谢谢
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1F：推 Hevak:国中就读英文的数学题目真强orz 10/09 21:59
2F：→ lovekyoko:不是拉 这是GMAT的考题 但观念是国中的 10/09 22:05
3F：推 gj942l41l4:GMAT考这个= = 10/09 22:30