| N | Min | Max | Range | Mean | Var | Std | CV(%) |
251-10 | 50 | 17.96 | 26.25 | 8.29 | 21.79286 | 3.576547 | 1.891176 | 8.677961 |
251-12 | 50 | 16.42 | 25.14 | 8.72 | 21.34167 | 5.86847 | 2.422492 | 11.351 |
251-14 | 50 | 19.99 | 28.32 | 8.33 | 21.32546 | 5.409554 | 2.325845 | 10.8818 |
251-16 | 50 | 16.78 | 32.51 | 15.73 | 21.96936 | 6.599606 | 2.56897 | 11.69342 |
251-18 | 50 | 17.41 | 32.61 | 15.2 | 23.34625 | 10.45348 | 3.233184 | 13.84882 |