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标题: NN帮助一下这个题,好难 [打印本页]

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作者: kennypl    时间: 2006-10-15 15:44
标题: NN帮助一下这个题,好难

Q17:

The number of defects in the first five cars to come through a new production line are 9, 7, 10, 4, and 6, respectively.  If the sixth car through the production line has either 3, 7, or 12 defects, for which of theses values does the mean number of defects per car for the first six cars equal the median?

 

I.                    3

II.                 7

III.               12

 

 

A.   I only

B.    II only

C.   III only

D.   I and III only

E.    I, II, and III

NN解释一下这个题目,不理解,答案是D

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作者: loveOB    时间: 2006-10-15 16:08

以下是引用kennypl在2006-10-15 15:44:00的发言：

Q17:

The number of defects in the first five cars to come through a new production line are 9, 7, 10, 4, and 6, respectively.  If the sixth car through the production line has either 3, 7, or 12 defects, for which of theses values does the mean number of defects per car for the first six cars equal the median?

 这道题其实相当于：已知9，7，10，4，6五个数，问如果插入3，7，12中的哪个，所得的这六个数的中位数等于平均数？这样是不是就可以理解了？

 这道题其实相当于：已知9，7，10，4，6五个数，问如果插入3，7，12中的哪个，所得的这六个数的中位数等于平均数？这样是不是就可以理解了？

I.                    3

II.                 7

III.               12

 

 

 

 

A.   I only

B.    II only

C.   III only

D.   I and III only

E.    I, II, and III

NN解释一下这个题目,不理解,答案是D

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作者: kennypl    时间: 2006-10-15 17:05
3X     忘记了中位数是先排序了....哎

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作者: cpcjustin    时间: 2006-10-16 05:50
this problem is easy, but it takes a long time to slove, anybody has the shortcuts?

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