|
|
| 频率 | 百分比 | 有效百分比 | 累计百分比 |
| 有效 | 3.0 | 3 | 15.0 | 15.0 | 15.0 |
| 4.0 | 4 | 20.0 | 20.0 | 35.0 | |
| 5.0 | 13 | 65.0 | 65.0 | 100.0 | |
| 总计 | 20 | 100.0 | 100.0 |
|