CBSE · Class 11 · Mathematics · Chapter 13

Statistics

Measures of central tendency and dispersion.

6 lessons 105 min
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Lessons in this chapter

  1. 1Why Averages Need DispersionDiscover why a centre cannot describe a whole dataset, and measure spread with range and mean deviation.
  2. 2Mean Deviation in Frequency DistributionsUse frequencies, cumulative counts and class midpoints to measure average distance from a centre.
  3. 3Variance and Standard DeviationAverage squared deviations to measure spread, then restore the original unit with a square root.
  4. 4Grouped Variance and Shortcut CalculationsCalculate spread from class intervals and connect direct, second-moment and coded methods.
  5. 5How Data Changes: Scaling and CorrectionsPredict the effects of shifting and scaling, recover missing values, and repair statistics after data errors.
  6. 6Chapter Summary and PracticeConnect every measure of dispersion, select a calculation method, and reason through mixed data problems.
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