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En una variable X, s'han observat els següents valors presentats com dades agrupades
| Xi | ni |
| 3 | 1 |
| 5 | 4 |
| 6 | 7 |
| 8 | 11 |
| 9 | 7 |
| 10 | 1 |
Calcula el sumatori de les puntuacions.