数学问题求解！！！

curious0814 · 发表于 2010-10-23 19:29:31

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?
1.At least one of the homes was sold for more than $165,000
2.At least one of the homes was sold for more than $130,000 and less than $150,000
3.At least one of the homes was sold for less than $130,000
A 1only
B 2only
C 3only
D 1and2
E 1and3

zhlee · 发表于 2010-10-23 20:12:39

选A

serenashu · 发表于 2010-10-23 20:14:00

选A？

笨笨熊41 · 发表于 2010-10-23 20:26:19

中数是130,000，平均数为150,000，所以假定要有一个数为170,000，由于中数前面的数全部小于130,000，所以后面的7个数里有很大的。具体就不用再想了，只有A正确。
lz看看对不对

curious0814 · 发表于 2010-10-24 00:08:57

恩，谢谢大家~答案是A

数学问题求解！！！

所属分类: GMAT考试

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