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**Measures of variability:**

The measure of variability or the measures of dispersion can be measured using the statistics range, interquartile range, standard deviation and coefficient of variation. Among these 4 measures of dispersion, coefficient of variation gives the variation in the data set relative to its mean. Hence, coefficient of variation is said to be best measure of variability.

The general formula for coefficient of variation is,

*CV *= (*SD/X*BAR)*100

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