Answer
$13064\ k$
Work Step by Step
Step 1. Identify the needed data: $x_1=2008, f(x_1)=270,334\ k$ and $x_2=2013, f(x_2)=335,652\ k$
Step 2. Use the formula for the average rate of change: $m=\frac{f(x_2)-f(x_1)}{x_2-x_1}$, we have $m=\frac{335652-270334}{2013-2008}\approx13064\ k$