某公司有15名员工，他们所在的部门及相应每人所创的年利润如下表所示：
（1）该公司每人所创年利润的平均数是______万元． （2）该公司每人所创利润的中位数是______万元． （3）你认为应该使用平均数和中位数中哪一个来描述该公司每人所创年利润的一般水平？答：______（请填“平均数”或“中位数”） |
（1）
=. x
=6.4（万元）40×1+10×1+5×2+4.2×4+2.5×2+3.5×2+2.4×3 13
即该公司每人所创年利润的平均数是6.4万元．
（2）将数据排列（从小到大）发现正中间的数据为4.2，
故该公司每人所创年利润的中位数是4.2（万元）．
（3）因为该组数据中数据40异常，影响了该组数据的一般水平，
所以应使用中位数来描述该公司每人所创年利润的一般水平．
| 完型填空。 | ||||
| The earth is our home. We must take care of it. Life today is easier that it was 1 years ago, but it has brought some new problems. One of the biggest problems is pollution. We can see it, drink it and even hear it. Man has polluted the 2 . The more people, the more pollution. Many years ago, the problem was not so serious because there were not so 3 people. When the land was used up (用光) or the river was not clean in a place, man went to 4 place. Now man is slowly polluting the whole world. 5 pollution is still the most serious, it's bad for 6 thing in the world. Many countries don't let people burn (燃烧) 7 for air in houses and factories in the city. Pollution by SO2 is now the most dangerous kind of air pollution. It's 8 to ride bikes. When you are tiding, there is no pollution. But even in developed countries, most people don't go to work by bike. It's not because bikes are expensive or people are tired if they ride to work. It's because the number of cars on the roads becomes larger. So more people 9 their bikes and go to work by car, then things are getting worse and worse. We should have special roads only for bikes and make it 10 difficult and expensive for drivers to take their cars into the city that they will go back to using their bikes. | ||||
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