Let us find the m

This is a grouped frequency distribution table.

Notice the greatest frequency is 28.

⇒ Modal class = 15 – 20

Mode is given by

Where,

L = Lower class limit of the modal class = 15

h = class interval of the modal class = 5

f₁ = frequency of the modal class = 28

f₀ = frequency of the class preceding the modal class = 18

f₂ = frequency of the class succeeding the modal class = 17

Substituting values in the formula of mode,

⇒

⇒

⇒ Mode = 15 + 2.38

⇒ Mode = 17.38

Thus, mode is 17.38.