Find the mode for the following frequency distribution.

For ungrouped frequency distribution -

Where, l = lower limit of modal class, f₁ = frequency of modal class, f₀ = frequency of class previous to modal class, f₂ = frequency of class next to modal class, and h = width of modal class(h = 10 here).

And, modal class is the class with highest frequency(here = 20 - 30)

⇒ Mode = 23.33