The frequency table shows information about the masses of 20 parcels delivered to an office.
| Mass (m m\,m kg) | Frequency |
|---|---|
| 0 to 4 | 4 |
| 5 to 9 | 7 |
| 10 to 14 | 5 |
| 15 to 19 | 3 |
| 20 to 24 | 1 |
Calculate an estimate for the mean mass of the parcels.
111 exam-style questions on OCR GCSE Maths Averages from Frequency Tables. Each one has a worked solution and a mark scheme showing where the marks go.