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For mode:

Here, highest frequency is 18.

So, the modal class = 4000-5000

Mode is given by

Where,

L = Lower class limit of the modal class = 4000

h = class interval of the modal class = 1000

f₁ = frequency of the modal class = 18

f₀ = frequency of the class preceding the modal class = 4

f₂ = frequency of the class succeeding the modal class = 9

Substituting values in the formula of mode,

⇒

⇒ Mode = 4000 + 608.7

⇒ Mode = 4608.7

Thus, the mode of the data is 4608.7.