prep 2-63

evenlasting

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~

shuishuiles

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

evenlasting

 哦，我懂了。谢谢~