标题: prep 数学题一道 请教各位牛人 [打印本页] 作者: lmylacoste 时间: 2011-12-26 14:13 标题: prep 数学题一道 请教各位牛人 For a certain set of n numbers,where n>1,is the average(arithmetic mean)equal to the median? 1)If the n numbers in the set are listed in increasing order,then the difference between any pair of successive numbers in the set is 2. 2)The range of the n numbers in the set is 2(n-1)
why the answer is only (1)? in an arithmetic progression,only n is an odd,then the arithmetic mean would be the median,if an even,won't be....