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 |
A computer chip manufacturer expects the ratio of the number of defective chips to the total number of chips in all furture shipments to equal the correspanding ratio for shipments S1,S2,S3,and S4 combined, as shoown in ther table above. What is the expected number of defective chips in a shipment of 60,000chips? A.14 B,20 C,22 D,24 E,25 我对题目的理解有问题,说白了就是看不懂。就更不要说计算了。 请帮白痴解答一下,谢谢 呵呵 |