Averages Questions for ADRE Grade III 2027
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Averages — Quick Overview
Average is sum divided by count. ADRE asks weighted average and changed average problems.
Key Formula
Average = Sum/Count | New average after adding x: (Old sum + x)/(n+1)
Exam Tip
Shortcut: if one value changes, change in average = change in value ÷ total count.
Common Trap
Average of averages is wrong unless the groups are equal in size. Always recalculate from totals.