[求助]gwd 7-22

janejane1009

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

答案选D

但计算出来只有7可以啊

谢谢！

mymengming

这个题目只能带入计算

加入是3，则mean＝median＝6.5

……

答案是D

yingchunh

我也觉得答案错了！

gunius23

同问！

emilia0821

这题没有问题 mean是平均值的意思 选D