Balanço
A)
| |Fi |
|90|-100 |4 |
|80|-90 |7 |
|70|-80 |9 |
|60|-70 |11 |
|50|-60 |9 |
|40|-50 |6 |
|30|-40 |4 |
|Σ |50 |
b) 50
c)
| |Fi |fi |
|90|-100 |4 |0,08 |
|80|-90 |7 |0,14 |
|70|-80 |9 |0,18 |
|60|-70 |11 |0,22 |
|50|-60 |9 |0,18 |
|40|-50 |6 |0,12 |
|30|-40 |4 |0,08 |
|Σ |50 |1 |
d)
| |Fi |Fac |
|30|-40 |4 |4 |
|40|-50 |6 |10 |
|50|-60 |9 |19 |
|60|-70 |11 |30 |
|70|-80 |9 |39 |
|80|-90 |7 |46 |
|90|-100 |4 |50 |
|Σ |50 | |
| | | |
e)
| |Fi |fi |fiac |
|90|-100 |4 |0,08 |0,08 |
|80|-90 |7 |0,14 |0,22 |
|70|-80 |9 |0,18 |0,4 |
|60|-70 |11 |0,22 |0,62 |
|50|-60 |9 |0,18 |0,8 |
|40|-50 |6 |0,12 |0,92 |
|30|-40 |4 |0,08 |1 |
|Σ |50 |1 | |
f)
2)
b) 40
c)
|xi |Fi |fi |
|3 |2 |0,05 |
|4 |5 |0,125 |
|5 |12 |0,3 |
|6 |10 |0,25 |
|7 |8 |0,2