The frequency table shows the masses of 80 parcels delivered by a courier.
a.
[2]
On the grid, plot a cumulative frequency graph for this information.
| Mass (m m\,m kg) | Frequency |
|---|---|
| 0<m≤20 < m \le 20<m≤2 | 8 |
| 2<m≤42 < m \le 42<m≤4 | 14 |
| 4<m≤64 < m \le 64<m≤6 | 26 |
| 6<m≤86 < m \le 86<m≤8 | 17 |
| 8<m≤108 < m \le 108<m≤10 | 10 |
| 10<m≤1210 < m \le 1210<m≤12 | 5 |
b.[1]
Find an estimate for the number of parcels weighing more than 9 kg.