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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