Define the following -

1) Absolute dispersion

2) Relative dispersion

3) Quartile deviation

1. Absolute measures of dispersion : These are those measures of dispersion that are expressed in terms of original unit of series. For example, range and quartile deviation are absolute measures of dispersion.
2. Relative measures of dispersion : These are those measures of dispersion that are expressed in terms of relative value of percentage. for example coefficient of range, coefficient of quartile deviation are relative measures of dispersion.
3. Quartile deviation: It is the half of the difference between upper quartile and lower quartile. Quartile Deviation is an absolute measure of dispersion and does not take into consideration all the items of the series

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