某公司生产三种型号的轿车，产量分别为A型号1200辆、B型号6000辆和C型号2000辆．为检验这三种型号轿车的质量，现用分层抽样的方法抽取46辆进行检验，那么C型号的轿车应抽取______ 辆．
因总轿车数为9200辆，而抽取46辆进行检验，抽样比例为
=46 9200
，1 200
而三种型号的轿车有显著区别，根据分层抽样分为三层按
比例，1 200
那么C型号的轿车应抽取2000×
=10辆．1 200
故答案为：10．
| 阅读短文，根据短文内容完成相关任务。 | ||||
| We all have many things to do every day. We study hard at school. We play games after class. We do our homework in the evening. We chat with our parents and friends when we have time. How can we do these things better? Sleep is the answer to this question. Sleep is our best doctor. Follow the advice (建议) below (在下面), and you will have a better life. ●Always sleep on the same bed and get up at the same time. ●Always go to bed at the same time. You can read a book or listen to music before sleep. ●Make your room dark, quiet and comfortable when you sleep . ●Use your room only for sleep . Take your computer and TV out of your room. ●Don’t have supper too late. After eating, you should wait for about two hours before you go to bed. ●Do exercise regularly (有规律地). If you want to do exercise, do it more than two hours before you go to bed. ●Don’t drink coffee or tea or eat chocolates before sleep. They can keep you awake. | ||||
6._____ 7._____ 8._____ 9._____ 10._____ | ||||