| HORAS | F | PM | PM.F | pm-x | (pm-x)2 | fi(pm-x)2 |
| 0-1 | 36 | 0.5 | 18 | 15.1 | 228.01 | 8208.36 |
| 2-3 | 48 | 2.5 | 120 | 117.1 | 13712.41 | 658195.68 |
| 4-5 | 66 | 4.5 | 297 | 294.1 | 8649481.81 | 5708657.46 |
| total | 150 | | 453 | | | 6375061.6 |
X= 435/150 X=2.9
S= (raiz cuadrada de) 6375061.6/ 149
S=206.84
Btw el dos es al cuadrado :D
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