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Let $ \mathbb{F}_q[T]$\, be the ring of polynomials over a finite field $\mathbb{F}_q $. Let $ g: \mathbb{F}_q[T] \rightarrow \mathbb{R} $ be amultiplicative function such that for any irreducible polynomial $ P $ over $\mathbb{F}_q $ and any $ k \ge 1 $, the equality $ d_k = g (P ^ k) $ holds forsome arbitrary sequence of reals $\{d_k\}_{k=1}^{\infty}$. In this paper, weget an explicit formula for the sum $$ T (N) = \sum\limits_{\substack{\deg F=NF \text{ is monic}}}{g (F)}, $$ and also derive different asymptotics when thissum in cases of $ q \to \infty; \ q \to \infty, \ N \to \infty; \ q ^ N \to\infty $.

On the mean value of the functions related to the divisor function on the ring of polynomials over a finite field