- The partially completed histogram and the partially completed table show the time, to the nearest minute, that a random sample of motorists was delayed by roadworks on a stretch of motorway.
\includegraphics[max width=\textwidth, alt={}, center]{8f3dbcb4-3260-4493-a230-12577b4ed691-04_1227_1465_354_301}
| Delay (minutes) | Number of motorists |
| 4-6 | 6 |
| 7-8 | |
| 9 | 17 |
| 10-12 | 45 |
| 13-15 | 9 |
| 16-20 | |
Estimate the percentage of these motorists who were delayed by the roadworks for between 8.5 and 13.5 minutes.