5 A driver records the distance travelled in each of 150 journeys. These distances, correct to the nearest km , are summarised in the following table.
| Distance \(( \mathrm { km } )\) | \(0 - 4\) | \(5 - 10\) | \(11 - 20\) | \(21 - 30\) | \(31 - 40\) | \(41 - 60\) |
| Frequency | 12 | 16 | 32 | 66 | 20 | 4 |
- Draw a cumulative frequency graph to illustrate the data.
\includegraphics[max width=\textwidth, alt={}, center]{3f05dc2a-b466-40bc-9f5f-0fd2bff120c8-06_1593_1397_852_415} - For 30\% of these journeys the distance travelled is \(d \mathrm {~km}\) or more.
Use your graph to estimate the value of \(d\).
- Calculate an estimate of the mean distance travelled for the 150 journeys.