a computer chip manufacturer expects the ratio of the number of the 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 show in the table, what is the expected number of defective number of chips in a shipment of 60000 chips? shipment defective # total # s1 2 5000 s2 5 12,000 s3 6 18,000 s4 4 16000 a,14 b,20 c,22 d,24 e,25 答案選20
爲什麽不是22呢 我的想法是 S2+S3=30K DEFECTIVE=5+6=11 那60K 的話就是11*2=22 wut is the greatest possible area of a triangular region with one vertex at the center of a circle r=1 and the other two vertices on the circle?