Q. 84.3( 12 Votes )

In the following

Answer :

To find p and q, solve by finding cumulative frequency,


p = 11 + 12 = 23


And 46 = 33 + q q = 46 – 33 = 13


p = 23 and q = 13


Lets form the table again,



For modal class,


Here, the maximum class frequency is 20.


The class corresponding to this frequency is the modal class. modal class = 500 - 600


To find median class,


Assume Σfi = N = Sum of frequencies,


fi = frequency


and Cf = cumulative frequency


So, N = 80


N/2 = 80/2 = 40


The cumulative frequency just greater than (N/2 = ) 40 is 46, so the corresponding median class is 400 - 500.


modal class = 500 - 600 and median class = 400 - 500

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