某地区年初人口为500万，该年迁入口5万，年末人口为510万，则该_爱下问搜题

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问题单项选择题

某地区年初人口为500万，该年迁入口5万，年末人口为510万，则该年该地区迁入率为（）。

A.9.76‰

B.9.84‰

C.9.90‰

D.9.95‰

答案

参考答案：C

解析：由于年平均人口数=（年初人口数+年末人口数）/2=（500+510）/2=505（万），故年迁入率=年迁入人口数/年平均人口数×1000‰=（5/505）×1000‰=9.90‰。

填空题

8、4、7、4、3、5、4这组数据中，中位数是______，众数是______，平均数是______．

改错题

I'd like to tell you something about my friend Peter.
He is a clever boy, and sometimes he is lazy.
Last term, he doesn't study hard at school. He
failed all the subject except math. English
was worst of all.
With the help of the teachers, he works very hard and
becomes a top student in our class in this term.

1.________
2.________
3.________
4.________

5.________