Answer :

Here, we need to find the median class and modal class.

Let us find median class.


Let us create a table.



Here, total sum of frequency, N = 77




Note in the table that, cf = 42 is just greater than 38.5.


Median class = 125 – 145


Now, let us find modal class.


For modal class, just check the greatest frequency.


Here, the greatest frequency = 20


Modal class = 125 – 145


Upper class limit of median class = 145


Lower class limit of modal class = 125


Difference = Upper class limit of median class – Lower class limit of modal class


Difference = 145 – 125


Difference = 20


Thus, answer is 20.


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