一根绳子长2分米，把它剪成5厘米长的小段，要剪（   ）

Dear friend,
       I am an American (美国的 ) girl. My name is Alice Green. I am a middle school student. I am fifteen. I have two brothers. They are middle school students, too. We go to school from Monday to Friday. We don't have any classes on Saturdays and Sundays. My father and mother are teachers. They always say China is great. I like reading. I am reading a Chinese book. I think it's very interesting. My brothers and I like playing football and basketball. What sports do you like?
     Let's be good pen pals (笔友), OK? Please write to me soon.
Yours,
Alice Green

我把发现的规律告诉你：____

____

中国式过马路，是网友对部分中国人集体闯红灯现象的一种调侃，即“凑够一撮人就可以走了，和红绿灯无关”针对这种现象某媒体记者在多个路口采访闯红灯的行人，得出形成这种现象的四个基本原因：①红绿灯设置不科学，交通管理混乱；②侥幸心态；③执法力度不够；④从众心理．该记者将这次调查情况整理并绘制了如下尚不完整的统计图，请根据相关信息，解答下列问题．

（1）该记者本次一共调査了多少行人？

（2）求图1中④所在扇形的圆心角，并补全图2；

（3）在本次调查中，记者随机采访其中的一名行人，求他属于第②种情况的概率．