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标题: TT MATH 4-13 [打印本页]

作者: 小萧笑    时间: 2009-1-19 07:39     标题: TT MATH 4-13

Lists S and T consist of the same number of positive integers.  Is the median of the integers in S greater than the average (arithmetic mean) of the integers in T?

(1)   The integers in S are consecutive even integers, and the integers in T are consecutive odd integers.

(2)     The sum of the integers in S is greater than the sum of the integers in T.

答案给的是C

我选E

举例来看

S={2,4,6} T={1,3,5},符合条件(1)(2)

S的中位数是4,T的平均数是4.5。此时S的中位数小于T的平均数。

S={4,6,8} T={1,3,5},符合条件(1)(2)

S的中位数是6,T的平均数是4.5,此时S的中位数大于T的平均数

所以两个条件都不足以得出结论

请问这样想哪里有错误?

谢谢指教


作者: ziwingfong    时间: 2009-1-19 19:11

T的平均数是3,9/3=3你干嘛除二呢
作者: 小萧笑    时间: 2009-1-22 13:24

明白了 谢谢啊 脑子短路了 我还算了好多遍




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