The extent to which the observations in a sample or in a population vary about their mean is known as dispersion. • The greater the variability (spread) of the distribution, the greater the deviations from the mean (ignoring the signs of the deviation). Range is the best measure of variability when the data are too scattered or too scant. Variance/Standard Deviation for Grouped Data The variance of a sample of data organized in a frequency distribution is computed by the following formula: S2 = Pk i=1 f ix2 i Pk i1 f ix i! Lesson 4: Measures of Variability of Grouped Data Measure of Central Tendency of a Grouped Data mean= (∑fx) (∑f) f - frequency x - class mark Mean Median Mode Coded Deviation (∑f) -

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