Find bases for the fundemental subspaces of the matrix : A = | 0 -1 1 |
| 1 2 0 |
| 1 1 1 |

The definition of variability in math is, basically, the extent of which certain points of data diverge from normal or average. According to this, the intequartile range would be the most helpful in determining the variability in chapter length. Also, the Range and Median would be helpful, to a much smaller extent though.