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标题: 一道gwd数学题 [打印本页]

作者: WalkByFaith 时间: 2006-9-8 07:03 标题: 一道gwd数学题

Tom, Jane, and Sue each purchased a new house. The average (arithmetic mean) price of the three houses was $120,000. What was the median price of the three houses?

(1) The price of Tom’s house was $110,000.

(2) The price of Jane’s house was $120,000.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

答案是b. 可我认为是c，因为只有给出任一两者的，第三者的才能知道，这样就可求出了呀！请高手指点迷津哦

作者: windfalls 时间: 2006-9-8 19:57

掉了一个词，应是“这样就可求出median了呀"

作者: uniqueness 时间: 2006-9-9 08:27

（2）三人平均为120000，其中一个人已经知道是120000，那么另外两个人必定是一

个比120000大一个比12000小，所以中值一定是120000。

反之，如果另俩人都比120000大则三人平均大于120000，如果另俩人都比120000小则三

人平均小于120000，与题干不符。

选B

作者: WalkByFaith 时间: 2006-9-14 13:06

一语道破天机，好厉害哦！

作者: forwardxu 时间: 2006-9-15 09:27

补充一点,就是倘若三个人都是120000,中数也应该是120000

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