得到如下频率分布表
分组 | 频数 | 频率 |
[ 1.5,4.5] | 22 | 0.22 |
[ 4.5,7.5] | 31 | 0.31 |
[ 7.5,10.5] | x | 0.16 |
[ 10.5,13.5] | 10 | 0.10 |
[ 13.5,16.5] | y | z |
[ 16.5,19.5] | 5 | 0.05 |
[ 19.5,22.5] | 5 | 0.05 |
[ 22.5,25.5] | 3 | 0.03 |
[ 25.5,28.5] | 2 | 0.02 |
合计 | 100 | 1. |