题目内容

观察下面表格:
(1)完成表中的频率分布表;
(2)根据表格,画出频率分布直方图;
(3)估计数据落在[10.95,11.35)范围内的概率约为多少?
分组
频数
频率
[10.75,10.85)
3
 
[10.85,10.95)
9
 
[10.95,11.05)
13
 
[11.05,11.15)
16
 
[11.15,11.25)
26
 
[11.25,11.35)
20
 
[11.35,11.45)
7
 
[11.45,11.55)
4
 
[11.55,11.65)
2
 
合计
100
 
 
(1)频率依次为:0.03,0.09,0.13,0.16,0.26,0.20,0.07,0.04,0.02,1.00.
(2)

(3)0.75
(1)频率依次为:0.03,0.09,0.13,0.16,0.26,0.20,0.07,0.04,0.02,1.00.
(2)频率分布直方图如图所示

(3)数据落在[10.95,11.35)范围的频率为
0.13+0.16+0.26+0.20=0.75.
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