3 The table summarises the times that 112 people took to travel to work on a particular day.
| Time to travel to | | work \(( t\) minutes \()\) |
| \(0 < t \leqslant 10\) | \(10 < t \leqslant 15\) | \(15 < t \leqslant 20\) | \(20 < t \leqslant 25\) | \(25 < t \leqslant 40\) | \(40 < t \leqslant 60\) |
| Frequency | 19 | 12 | 28 | 22 | 18 | 13 |
- State which time interval in the table contains the median and which time interval contains the upper quartile.
- On graph paper, draw a histogram to represent the data.
- Calculate an estimate of the mean time to travel to work.