In a class test,

Here, the maximum class frequency is 25.

The class corresponding to this frequency is the modal class. ⇒ modal class = 40 - 60

To find median class,

Assume Σf_i = N = Sum of frequencies,

f_i = frequency

and C_f = cumulative frequency

Lets form a table.

So, N = 50

⇒ N/2 = 50/2 = 25

The cumulative frequency just greater than (N/2 = ) 25 is 35, so the corresponding median class is 40 - 60.

∴ modal class = 40 - 60 and median class = 40 - 60