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Interpret and complete seasonal indices

DIFFICULTYintrostandardchallengeexam
QUESTION TYPEMix of allChange
four-seasons; 1 decimal-place indices; interpretation and percentagefour-seasons; 2 decimal-place indices; interpretation and percentagesix-periods; 1 decimal-place indices; interpretation and percentagesix-periods; 2 decimal-place indices; interpretation and percentageNOWMix of allRecommended
Question 1 of 8

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A council records the mass of garden waste collected in each season. The table gives a seasonal index for each listed period

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

Unit: tonnes
PeriodSeasonal index
Jan–Feb0.7
Mar–Apr1.3
May–Jun0.7
Jul–Aug1.3
Sep–Oct1.3
Nov–Dec0.7
(a)1 mark

What does the seasonal index for Sep–Oct indicate about typical mass of garden waste?

(b)1 mark

By what positive percentage is the typical mass of garden waste in Sep–Oct above or below the average seasonal value?

Format: positive percentage