| Volunteer 1 | Volunteer 2 | Volunteer 3 | |
| Slow speed | 3.9% | 4.2% | 3.6% |
| Medium speed | 2.6% | 2.5% | 2.4% |
| Fast speed | 3.2% | 3.2% | 3.3% |
| Mean error | 3.2% | 3.3% | 3.1% |