# In the following

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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