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Dear Student
The maximum frequency is 25 and it belongs to class 30-40
Therefore the modal class = 30-40
Lower limit ,l =  30
Frequency of modal class f₁ = 25
class size h=10
Frequency of class preceding the modal class f₀ =20
 Frequency of class succeeding the modal class = 12
Mode = 
$$\begin{gathered} l+\left(\frac{f_1-f_0}{2f_1-f_0-f_2}\right)\times h \\ =30+\left(\frac{25-20}{2\times 25-20-12}\right)\times 10 \\ =30+\left(\frac{5}{18}\right)\times 10 \\ =37.78 \\ Regards \end{gathered}$$