[求助]数学题一道

celery28 · 发表于 2008-6-3 22:55:00

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 60000 chips?

对应的图表： shipment number of defective chips in the shipment total number of chips in the shipment

S1 2 5000

S2 5 12000

S3 6 18000

S4 4 16000

题目看不明白，谢谢了，哪位帮个忙

shawn0311 · 发表于 2008-6-4 06:43:00

题目的意思就是新增加的shipment中，number of defective chips in the shipment与total number of chips in the shipment的比例，与s1,s2,s3,s4的和的比例是相同的，列式子就是：设新增加的shipment中number of defective chips in the shipment为X，则X/60000=(2+5+6+4)/(5000+12000+18000+16000),得到X=20。MM看看对不，加油！

celery28 · 发表于 2008-6-4 21:57:00

对的

谢谢

[求助]数学题一道

[求助]数学题一道

所属分类: GMAT考试

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