题目列表(包括答案和解析)
| 分组 | 频数 | 频率 |
| [39.95,39.97) | 10 | |
| [39.97,39.99) | 20 | |
| [39.99,40.01) | 50 | |
| [40.01,40.03] | 20 | |
| 合计 | 100 |
| 分组 | 频数 | 频率 |
| [39.95,39.97) | 10 | |
| [39.97,39.99) | 20 | |
| [39.99,40.01) | 50 | |
| [40.01,40.03] | 20 | |
| 合计 | 100 |
| 分组 | 频数 | 频率 |
| [39.95,39.97) | 10 | |
| [39.97,39.99) | 20 | |
| [39.99,40.01) | 50 | |
| [40.01,40.03] | 20 | |
| 合计 | 100 |
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