Interpret and complete seasonal indices
A council records the mass of garden waste collected in each season. The index for each period compares its typical value with the average seasonal value
The displayed indices are exact at 1 decimal place; no unshown decimal places are used. Their average is exactly 1, so their sum is 6
The target period for interpretation is Sep–Oct
| Period | Seasonal index |
|---|---|
| Jan–Feb | 0.6 |
| Mar–Apr | 0.9 |
| May–Jun | 1.3 |
| Jul–Aug | 1.1 |
| Sep–Oct | 1.4 |
| Nov–Dec | 0.7 |