The waiting times, in minutes, of 20 visitors at a clinic are recorded below.
| 4 | 10 | 7 | 12 | 20 |
|---|---|---|---|---|
| 15 | 18 | 20 | 21 | 30 |
| 24 | 28 | 30 | 26 | 29 |
| 31 | 40 | 35 | 38 | 40 |
Complete the grouped frequency table.
[3]| Waiting time, \(t\) (minutes) | Frequency |
|---|---|
| \(0<t\leq10\) | |
| \(10<t\leq20\) | |
| \(20<t\leq30\) | |
| \(30<t\leq40\) |
State the modal class.
[1]Draw a histogram to represent the data. Label both axes clearly.
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