3 The speeds, in \(\mathrm { km } \mathrm { h } ^ { - 1 }\), of 90 cars as they passed a certain marker on a road were recorded, correct to the nearest \(\mathrm { km } \mathrm { h } ^ { - 1 }\). The results are summarised in the following table.
| Speed \(\left( \mathrm { km } \mathrm { h } ^ { - 1 } \right)\) | \(10 - 29\) | \(30 - 39\) | \(40 - 49\) | \(50 - 59\) | \(60 - 89\) |
| Frequency | 10 | 24 | 30 | 14 | 12 |
- On the grid, draw a histogram to illustrate the data in the table.
\includegraphics[max width=\textwidth, alt={}, center]{5307cf3d-3d3a-441a-83d7-4adad917e168-04_1594_1198_657_516} - Calculate an estimate for the mean speed of these 90 cars as they pass the marker.