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534 B

The exercice is validated is all questions of the exercice are validated
The question 1 is validated if the imp_mean.statistics_ returns:
```console
array([ 4., 13.,  6.])
```
The question 2 is validated if the filled train set is:
```console
array([[ 7.,  6.,  5.],
    [ 4., 13.,  5.],
    [ 1., 20.,  8.]])
```
The question 3 is validated if the filled test set is:
```console
array([[ 4.,  1.,  2.],
    [ 7., 13.,  9.],
    [ 4.,  2.,  4.]])
```