Here are the daily high temperatures (in ∘C^\circ\text{C}∘C) recorded in a greenhouse over a 20-day period.
| 21 | 25 | 18 | 44 | 22 |
| 33 | 28 | 15 | 21 | 22 |
| 12 | 28 | 19 | 42 | 28 |
| 30 | 31 | 35 | 40 | 36 |
Draw an ordered stem and leaf diagram to show this information. You must include a key.
Work out the median temperature.
Another temperature is recorded as 50∘C50^\circ\text{C}50∘C. Sarah says: "This means the median temperature will increase." Is Sarah correct? You must explain your answer.