Prelims · 8 Mental Ability · 8.4 Ratio, ages, averages and mixtures

8.4.4 Averages: replacement, inclusion and exclusion

An average is total ÷ count, so nearly every average question is solved by converting averages into totals, adding or removing items, and dividing again.

  • APPSC Group 2 · Prelims
  • Standard level
  • 8 min read
  • Full course

Key terms

  • average
  • arithmetic mean
  • replacement
  • inclusion
  • exclusion
  • wrong entry
  • overlapping groups
  • cricket average
  • bowling average

What this note covers

  1. Core factsFoundation
  2. ExplainedStandard
  3. DeeperAdvanced
  4. Common trapsFoundation
  5. Quick revisionFoundation

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