Class 11 Maths Statistics Measure of dispersion

Mean, Median, Mode are not sufficient to represent data

Consider the performance of 2 crickets, we need to find how is better?

In this case mean, median, mode is not helping to find better score. Mean, Median & mode has same value 50. We can see from the score that Red player is more consistent.  Measure of dispersion will help here.


Measure of dispersion

It is measure of variability or spread or scatter of data. Dispersion is contrasted with location or central tendency, and together they are the most used properties of distributions.

Types of dispersion

  • Range,
  • Quartile deviation,
  • Mean deviation,
  • Standard deviation

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