In the given data,

The maximum class frequency is 32. So, the modal class is 30-40.

Lower limit(l) of modal class = 30

Class size(h) = 40 - 30 = 10

Frequency(f₁) of modal class = 32

Frequency(f₀) of class preceding the modal class = 12

Frequency(f₂) of class succeeding the modal class = 20

And we know,

Substituting values, we get