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标题: [求助]gwd 7-22 [打印本页]

作者: aster2009 时间: 2009-8-30 10:56 标题: [求助]gwd 7-22

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！

作者: liaijun_2009 时间: 2009-8-30 21:58

这个题目只能带入计算

加入是3，则mean＝median＝6.5

……

答案是D

作者: goodfish 时间: 2009-8-31 06:44

我也觉得答案错了！

作者: tangdream 时间: 2009-9-1 06:26

这题没有问题 mean是平均值的意思选D

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