Answer
$487
Work Step by Step
$$m(\frac{x_{1}+x_{2}}{2},\frac{y_{1}+y_{2}}{2})$$
$$m(\frac{2000+2008}{2},\frac{354+620}{2})$$
$$m(\frac{4008}{2},\frac{974}{2})$$
$$m(2004,487)$$
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