<prompt> Which is not a measure of dispersion?Mean deviationStandard deviationModeRange  <response>: Ans: c Mode Ref: Park, 19th ed, p. 701Measures of dispersion include:a Mean deviationb Standard deviationc RangeThe range is the simplest measure of dispersion. It is the difference between the highest and lowest figures in the sample.Mean deviation-is the average of the deviations from the arithmetic mean, and is given by the fonnulaStandard deviation- is the most frequently used measure of deviation. It is defined as the root mean square deviation.Measures of central tendency include Mean Mode -- not affected by the extreme items. Median 