What are the objectives of measures of dispersion?
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1 To find the average distance of the items from an average.
2 To know the structure of the series.
3 To gauge the reliability of an average. When the dispersion is small, the average is reliable.
4 To know the limits of the items.
5 To serve as a basis for control of the variability itself.
6 To compare two or more series with regard to their variability.
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