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Onderste grens / Lower Boundary | Boonste grens / Upper Boundary | Frekwensie / Frequency |
| 26 | 35 | 18 |
| 36 | 45 | 27 |
| 46 | 55 | 32 |
| 56 | 65 | 22 |
| 66 | 75 | 15 |
| 76 | 85 | 8 |
Die kumulatiewe relatiewe frekwensie vir klasinterval 66 tot 75 is: / The cumulative relative frequency for the class interval 66 to 75 is: