Answer
$\left( \dfrac{19}{2},-4 \right)$
Work Step by Step
Using the Midpoint Formula, $\left( \dfrac{x_1+x_2}{2},\dfrac{y_1+y_2}{2} \right)$, then the midpoint between the given points is
\begin{array}{l}
\left( \dfrac{4-(-15)}{2},\dfrac{-6-2}{2} \right)
\\\\=
\left( \dfrac{19}{2},\dfrac{-8}{2} \right)
\\\\=
\left( \dfrac{19}{2},-4 \right)
.\end{array}