Answer
$\sqrt {202}$, $(-\frac{5}{2},-\frac{5}{2})$
Work Step by Step
Step 1. Given $M(-8,2), N(3,-7)$, the distance between the points is $d(M,N)=\sqrt {(-8-3)^2+(2-(-7))^2}=\sqrt {202}$
Step 2. The coordinates of the midpoint can be found as $(\frac{-8+3}{2},\frac{2-7}{2})$ or $(\frac{-5}{2},\frac{-5}{2})$