The cumulative frequency table shows the length, in cm, of a sample of salmon in a reservoir.
| Length (L L\,L cm) | Cumulative Frequency |
|---|---|
| 30<L≤4030 < L \leq 4030<L≤40 | 10 |
| 30<L≤5030 < L \leq 5030<L≤50 | 25 |
| 30<L≤6030 < L \leq 6030<L≤60 | 55 |
| 30<L≤7030 < L \leq 7030<L≤70 | 85 |
| 30<L≤8030 < L \leq 8030<L≤80 | 96 |
| 30<L≤9030 < L \leq 9030<L≤90 | 100 |
a.[2]
On the grid, plot a cumulative frequency graph for this information.
b.[2]
Find the median length.