define the term dispersion.

​​​​​Dear student,

Dispersion is a measure of the variation of the items from the central value.Simply saying it measures the extent to which a distribution is spread or squeezed.Kindly analyse the following distributions:

Factory A	Factory B	Factory C
400	350	50
400	380	75
400	400	400
400	420	725
400	450	750

In the above example,all the three factories have same median and mean i.e., 400.But there is no variation in factory A between the average wage and the wages paid to the different labourers{ex. 400-400=0}.
In factory B there is a small variation between the average wage and the wages paid to different labourers{400-350=50}.
And in factory C,there is a large variation between the average wage and the wages paid to the different labourers{Ex. 400-50=350}.Hence to measure the variation of items dispersion is used.

Regards.