Find the Midpoint of the Line Segment Whose Endpoints Are $( 3,1 )$

Multiple Choice

Find the midpoint of the line segment whose endpoints are the given points.
- $( 3,1 )$ and $( 9,4 )$

A) $( - 6,3 )$
B) $\left( 6 , \frac { 5 } { 2 } \right)$
C) $( 12,5 )$
D) $\left( - 3 , \frac { 3 } { 2 } \right)$