Find the mode of the following data:

Here, the maximum no. of students is 9, and the class corresponding to the frequency is 20 – 30.

So, the modal class is 20 – 30.

lower limit (l) of modal class = 20,

class size(h) = 10

frequency (f₁) of the modal class = 9

frequency (f₀) of class preceding the modal class = 5

frequency (f₂) of class succeeding the modal class = 3

Now, let us substitute these values in the formula

= 20 + 4

= 24