The masses, in kg, of 21 parcels in a delivery van are recorded below.
| 12 | 25 | 31 | 18 | 44 | 29 | 33 |
| 15 | 27 | 41 | 38 | 22 | 19 | 36 |
| 26 | 14 | 20 | 31 | 35 | 47 | 28 |
Draw an ordered stem and leaf diagram to show this information. You must include a key.
One of the parcels is selected at random. Find the probability that its mass is less than 30 kg.
