| Variable | Distribution | Mean Value | Standard Deviation | Minimum | Maximum |
|---|---|---|---|---|---|
| diameter(mm) | Normal | 47.84 | 0.25 | 47.46 | 48.4 |
| thickness(mm) | Normal | 3.29 | 0.13 | 2.98 | 3.44 |
| Fastener tightening torque(N.m) | Normal | 37 | 15 | 20 | 60 |
| Erection deviation(mm) | Normal | 0 | 16.77 | -33.55 | 33.55 |