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 mo

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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 mo
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

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 mo
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 上述例子也可以推翻.
而第一个答案,假设都在165000以内,中位数130000说有8套房子价格不大于130000,离平均数至少差钱20000*8=1600000,而后面7套最多高出平均数15000*7=105000少于160000 所以平均数一定达不到150000

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