已知一个样本：25,21.,23,25,27,29,25,28,30,29,26,24,25,27,2,22,24,25,26,28列出频率分布表,画频率分布直方图

已知一个样本：25,21.,23,25,27,29,25,28,30,29,26,24,25,27,2,22,24,25,26,28列出频率分布表,画频率分布直方图
已知一个样本：25,21.,23,25,27,29,25,28,30,29,26,24,25,27,2,22,24,25,26,28
列出频率分布表,画频率分布直方图

已知一个样本：25,21.,23,25,27,29,25,28,30,29,26,24,25,27,2,22,24,25,26,28列出频率分布表,画频率分布直方图
区间            频次   累加频次   累积 %
0-4.5                     1           1                5%
4.5-9.5                  0           1                 5%
9.5-14.5                0           1                5%
14.5--19.5             0           1                5%
19.5-24.5              5           6                30%
24.5-29.5             13         19              95%
29.5-34.5               1          20            100%