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?
(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
(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.
(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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