参数 | L ≤ 60 | 60 < L ≤ 100 | 100 < L ≤ 120 | 120 < L ≤ 170 | 170 < L ≤ 285 | L > 285 |
均值μ | 10 | 20 | 25 | 30 | 35 | 40 |
方差σ2 | 2 | 2 | 2 | 2 | 2 | 2 |