Why should we measure dispersion about some particular value? Do the range and quartile deviation measure dispersion about some values?

Why should we measure dispersion about some particular value? Do the r

1.	Why should we measure dispersion about some particular value? Do the range and quartile deviation measure dispersion about some values?
Answer» Solution :Firstly, with these methods we can assess how PRECISE is the central tendency as the representative value of all the OBSERVATIONS in the SERIES. Secondly, we can assess how SCATTERED are the actual observations from their representative value. All measures of dispersion do not measure variation about some particular value of the series such as range and quartile deviation.