问题
填空题
已知一组数据1，2，0，-1，x，1的平均数是1，则这组数据的极差为（ ）．
答案
4
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已知一组数据1，2，0，-1，x，1的平均数是1，则这组数据的极差为（ ）．
4
| 阅读理解。 | |||||||||||||||
| Here is the timetable of Yu-Huai Railway in Huaihua Railway Station. Read the information and then answer the questions.
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| 1. When should you get on the train if you go to Huaihua from Chongqing? | |||||||||||||||
| A. Before nine o'clock. B. After nine clock. C. At 9:45. | |||||||||||||||
| 2. How long does it take you to go to Chongqing from Huaihua by train? | |||||||||||||||
| A. About 9 and half hours. B. About 10 hours and a half. C. More than 11 hours. |