4 The times taken, in seconds, by 15 members of each of two swimming clubs, the Penguins and the Dolphins, to swim 50 metres are shown in the following table.
| Penguins | 35 | 39 | 42 | 44 | 45 | 45 | 48 | 50 | 56 | 58 | 59 | 61 | 66 | 68 | 72 |
| Dolphins | 36 | 41 | 43 | 48 | 49 | 49 | 50 | 51 | 54 | 56 | 56 | 60 | 61 | 64 | 71 |
- Draw a back-to-back stem-and-leaf diagram to represent this information, with Penguins on the left-hand side.
\includegraphics[max width=\textwidth, alt={}, center]{9b21cc0f-b043-4251-8aa9-cb1e5c2fb5d0-09_2720_33_141_20}
The diagram shows a box-and-whisker plot representing the times for the Penguins. - On the same diagram, draw a box-and-whisker plot to represent the times for the Dolphins.
\includegraphics[max width=\textwidth, alt={}, center]{9b21cc0f-b043-4251-8aa9-cb1e5c2fb5d0-09_719_1219_424_424} - Hence state one difference between the distributions of the times for the Penguins and the Dolphins.