PP2-61-PS

[pimi]

61. 6814-!-item-!-187;#058&004969
defective chip number
S1 2 5000
S2 5 12000
S3 6 18000
S4 4 16000
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
(C) 22
(D) 24
(E) 25

Ans:B

這題我真是找不出她們之間的比例關係, 請大大指導, 感激!!!

[a-jan]

me 不是大大....

題目是有點繞, 題目說：
一家電腦製造商預期生產晶片時會有瑕疵品，題目說要求出瑕疵品的比率是 => 瑕疵品 / 未來要裝運出貨的量 ;
題目提到未來的出貨量就是S1, S2, S3, and S4 combined, 最後題目問出貨 60,000會有多少件瑕疵品....

[(2+5+6+4) / (5,000+12000+18000+16000) ] x 60000 = 20

[pimi]

感激感激!!