| N | Min | Max | Range | Mean | Var | Std | CV(%) |
251-10 | 50 | 17.33 | 26.01 | 8.68 | 21.03148 | 3.455167 | 1.858808 | 8.844508 |
251-12 | 50 | 19.8 | 33.98 | 14.18 | 23.98364 | 15.77939 | 3.972327 | 16.55295 |
251-14 | 50 | 9.08 | 26.71 | 17.63 | 21.03889 | 11.17188 | 3.342436 | 15.88207 |
251-16 | 50 | 19.49 | 95.44 | 75.95 | 25.08311 | 138.7566 | 11.7795 | 46.96187 |
251-18 | 50 | 17.99 | 31.57 | 13.58 | 22.25 | 7.49389 | 2.737497 | 12.30336 |