cum. prof. (%) | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 |
N˚ if items | 13 | 28 | 57 | 105 | 172 | 264 | 386 | 547 | 761 | 1051 | 1453 | 2013 | 2871 |