分组 | 频数 | 频率 |
[2.5,7.5) | 2 | 0.002 |
[7.5,12.5) | m | 0.054 |
[12.5,17.5) | 106 | 0.106 |
[17.5,22.5) | 149 | 0.149 |
[22.5,27.5) | 352 | n |
[27.5,32.5) | 190 | 0.190 |
[32.5,37.5) | 100 | 0.100 |
[37.5,42.5) | 47 | 0.047 |
合计 | 1000 | 1.000 |