试题 试卷
题型:单选题 题类:常考题 难易度:普通
初中数学北师大版七年级下册6.2频率的稳定性练习题
分组
(90,100)
(100,110)
(110,120)
(120,130)
(130,140)
(140,150)
频数
1
2
3
10
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
以下是根据调查结果绘制的统计图表的一部分.
运动形式
A
B
C
D
E
人数
12
30
m
54
9
请你根据以上信息,回答下列问题:
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