Q. 174.2( 5 Votes )

Find the mean deviation about the median for the following data :


Answer :

we make the following table from the given data:


The class interval containing or 25th item is 20-30. Therefore, 20–30 is the median class. We know that



Here, l = 20, C = 13, f = 15, h = 10 and N = 50


Therefore,


Now,



We have, and




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