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Pentru analiza calitatii s-a stabilit urmatoarea distributie relativa a unui lot de piese, pe grupe ale greutatii lor, exprimata in grame. Care care este greutatea medie (rotunjit la numar intreg) a unei piese din acel lot?
| Grupe de piese dupa greutate (g) | Frecventa relativa a pieselor |
| xi | fi* |
| sub 250 | 10.0% |
| 250 - 350 | 12.5% |
| 350 - 450 | 52.3% |
| peste 450 | 25.2% |
| total | 100% |
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