Answer :
[tex]\begin{gathered} \text{ Given two points, on a graph} \\ (x_1,y_1)\text{ and }(x_{2,}y_2)\text{ then the} \end{gathered}[/tex][tex]\begin{gathered} \text{coordinate of the mid-point }(x_m,y_m)\text{ is given by} \\ x_m=\frac{x_1+x_2}{2},y_m=\frac{y_1+y_2}{2} \end{gathered}[/tex]
In this case, we can write out the parameters
[tex]\begin{gathered} x_1=2,_{}y_1=125, \\ x_2=98,y_2=15 \end{gathered}[/tex]Thus, substitute the coordinates in the mid-point formula and simplify
[tex]\begin{gathered} x_m=\frac{98+2}{2}=\frac{100}{2}=50 \\ y_m=\frac{125+15}{2}=\frac{140}{2}=70 \end{gathered}[/tex]Hence, the coordinate of the mid-point is (50, 70)