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标题: prep 2-63 [打印本页]

作者: evenlasting 时间: 2008-11-1 19:40 标题: prep 2-63

If m is a positive odd integer, what is the average (arithmetic mean) of a certain set of m integers?

(1) The integers in the set are consecutive multiples of 3.

(2) The median of the set of integers is 33.

答案是C.

请教大家~

作者: shuishuiles 时间: 2008-11-2 07:19

我这样理解的哦...

1)=>说明是个等差数列

2)=>因为是odd个数嘛,说明这几个数的平均数就是median咯

好像思维不太严密哈

作者: evenlasting 时间: 2008-11-3 20:25

哦，我懂了。谢谢~

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