求大家帮助看解此题机经63题

faytastic · 发表于 2011-2-20 03:21:50

<v2> 变体！！！
DS：一数列都是正整数，只有四个数X1，X2，X3，X4，问能够知道median么？
1）X1,X2 median是10 2）X2，X3，X4median是12

<v3> 我遇到的应该是这道题的变体吧，是说四个数，X1，X2，X3，X4，条件一是知道x1+x2等于一个确定的数，条件二是知道X2+X3+X4等于一个确定的数，好像也是问能够知道median么。
本题已在本月寂静中出现5次

这完全算不出来中数啊是不是选E呢

lindsay12 · 发表于 2011-2-20 03:34:55

in my opinion is E

sdcar2010 · 发表于 2011-2-20 07:11:11

On second thought, the answer is E, not C as I originally proposed. Sorry.

Let's assume X1 = 8, then X2 = 12. In this case, the median of the series is 12 for sure if we combine both conditions. In this case there are three possibilities for X2 in the series of X2, X3, and X4: biggest, smallest, or the middle. If X2 is the smallest, then either X3 or X4 is 12. So the median of the 4 numbers is 12. However, is X2 is the middle number, then we do not know the median value of the 4 numbers because we have to take an average of X2=12 with another undecided number. It could be X1=10 or X3=11. In sufficient.

So choose EEEEEEEEEEEEEEEE.

sdcar2010 · 发表于 2011-2-20 07:11:51

MEAN and MEDIAN are two different things.

tobiasyzy · 发表于 2011-2-20 11:25:34

sdcar 还是不懂你的意思啊。。。。。。求详解

sdcar2010 · 发表于 2011-2-20 13:19:31

sdcar 还是不懂你的意思啊。。。。。。求详解

-- by 会员 tobiasyzy (2011/2/20 11:25:34)

You are right in that my original post made no sense at all. Sorry.

I just changed it to a better answer.

求大家帮助看解此题机经63题

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