对照批次编号(组) |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
发病小鼠数(只) |
3 |
5 |
7 |
3 |
8 |
4 |
8 |
5 |
5 |
6 |
②求对照批次发病小鼠的总只数;