Answer
$3$
Work Step by Step
From the given figure, we have $f( 2)=7,\ \ \ f(0)= 1$
Then the average rate of change of $f(x) $ over $[0,2]$ is given by
\begin{align*}
\frac{f(2)-f(0)}{2-0}&=\frac{7-1}{2-0}\\&=3
\end{align*}
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