A streaming service logs how long each viewing session lasted, in minutes, across 39 sessions:
| Session length (min) | Frequency |
|---|---|
| [0, 20) | 2 |
| [20, 40) | 14 |
| [40, 60) | 5 |
| [60, 80) | 3 |
| [80, 100) | 4 |
| [100, 120) | 9 |
| [120, 140) | 2 |
Which term best describes the shape of this distribution?
Select all that apply.