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题型:解答题 题类:常考题 难易度:普通

初中数学北师大版九年级上册第三章 概率的进一步认识 (3)

电脑键盘上的字母为何不按顺序排列?请你来做一项统计,下面是一篇小短文,根据短文中字母a,b出现的机会完成后面提出的问题:

Two Trips

Jack brought a small plane and began to fly it. He soon became excited and made his plane all kinds of tricks.

Jack had a friend,named Tom. One day Jack said to him,“I will pick you up in my plane.““I will be glad to.'answered Tom. They went up,and Jack flew around for half an hour and did all kinds of tricks in the air. Then they came down. Tom was to be back safely,and said to Jack,“Well,Jack,thank you very much for those two trips in your plane.“Jack was very surprised and asked,“Two trips?““Yes,my first and my last.'an﹣swered Tom.

根据上文填表

出现字母的个数

100

150

200

250

300

350

400

出现字母a的频数

       

       

       

       

       

       

       

出现字母a的频率

       

       

       

       

       

       

       

出现字母b的频数

       

       

       

       

       

       

       

出现字母b的频率

       

       

       

       

       

       

       

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