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标题: prep2 61 求NN解答 [打印本页]

作者: нандин 时间: 2007-11-19 08:53
标题: prep2 61 求NN解答

61. 6814-!-item-!-187;#058&004969

[?]

A computer chip manufacturer expects the ratio of the number of defective chips to the total number of chips in all future shipments to equal the corresponding ratio for shipments S1, S2, S3, and S4 combined, as shown in the table above. What is the expected number of defective chips in a shipment of 60,000 chips?

(A) 14

(B) 20

(D) 24

(E) 25

这道题用哪方面面的知识？

[attachimg]62008[/attachimg]

[此贴子已经被作者于2007-11-19 8:53:38编辑过]

作者: sea_fairy 时间: 2007-11-19 09:45

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=146546

之前的讨论贴。。。。

作者: нандин 时间: 2007-11-19 10:09

谢谢sea_fairy 你真好我正在看呢赫赫

作者: нандин 时间: 2007-11-19 10:12

靠不会这么简单吧。。。。。。。。

(2+5+6+4)/(5000+12000+18000+16000)*60000 = 20

还是不明白哦为什么这么算。。。。。

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