分组 |
频数 |
频率 |
49.5-69.5 |
2 |
0.04 |
69.5~89.5 |
8 |
b |
89.5~109.5 |
20 |
0.40 |
109.5-129.5 |
a |
0.32 |
129.5-150.5 |
4 |
0.08 |
合计 |
c |
1 |