gmat数学题 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 onlyB.II onlyC.III onlyD.I and IIE.I and III
问题描述：
gmat数学题
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
上个月在x镇卖出15套房子.平均价格150000,中位数130000,下面哪个正确1,至少1套房子卖价超过165000第一个对假设第二个对,举出反例 前面8套都130000,后面7套都是172000 所以第二个不成立假设第三个成立 上述例子也可以...