5 The arrival times of 204 trains were noted and the number of minutes, \(t\), that each train was late was recorded. The results are summarised in the table.
| Number of minutes late \(( t )\) | \(- 2 \leqslant t < 0\) | \(0 \leqslant t < 2\) | \(2 \leqslant t < 4\) | \(4 \leqslant t < 6\) | \(6 \leqslant t < 10\) |
| Number of trains | 43 | 51 | 69 | 22 | 19 |
- Explain what \(- 2 \leqslant t < 0\) means about the arrival times of trains.
- Draw a cumulative frequency graph, and from it estimate the median and the interquartile range of the number of minutes late of these trains.