| Gap Range | Mean | Observations | |
| (−3, 0) | −2.31 | 1 | |
| (0, 2) | 0.98 | 4 | |
| (2, 4) | 2.86 | 11 | |
| (4, 6) | 4.73 | 5 | |
| (6, 8) | 6.65 | 2 | |
| (8, 10) | 7.70 | 2 | |
| Total | 25 | ||