Prelims · 8 Mental Ability · 8.6 Basic statistics and growth rates

8.6.2 Range, variance and standard deviation

Measures of dispersion tell how spread out the data are around the centre: range uses only the two extremes, while variance and standard deviation use every value.

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

Key terms

  • dispersion
  • spread
  • range
  • coefficient of range
  • mean deviation
  • variance
  • standard deviation
  • coefficient of variation
  • consistency
  • combined variance
  • wrong entry correction

What this note covers

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

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