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标题: 请教一道prep数学题 [打印本页]

作者: benzheren 时间: 2007-12-6 06:23 标题: 请教一道prep数学题

Last month 15 homes were sold in Town X, the average sale price of the homes was $150,000 and the median sale price was $130,000. WHich of the following statements must be true.

1) At least one of home was sold for is more than $165,000

2)At least one of the home was sold for is less than $130,000

why the 2nd statement is false?

作者: IORIYAGAMI 时间: 2007-12-6 20:18

这个是prep吗？是ds吗？不像ds的风格啊

作者: benzheren 时间: 2007-12-7 06:58

不是ds，中间还有一个错误的我没写

作者: IORIYAGAMI 时间: 2007-12-7 20:20

2)At least one of the home was sold for is less than $130,000

这个不对因为说的太绝对他说至少有一个小于130000

但是七个130000 其余大于130000 也可以

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