Answer
$$27$$
Work Step by Step
Since the average value of $g(t)$ is given by
\begin{align*}
M&=\frac{1}{5-2} \int_{2}^{5} g(t) d t\\
9&=\frac{1}{3} \int_{2}^{5} g(t) d t
\end{align*}
Then, we have:
$$ \int_{2}^{5} g(t) d t=27$$
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