Answer
The location of the center of mass is $1.9~cm$ in front of the hips.
Work Step by Step
We can find the distance $x_{com}$ in front of the hips that is the location of the center of mass:
$x_{com} = \frac{(68~kg)(0)+(8.0~kg)(18~cm)}{68~kg+8.0~kg}$
$x_{com} = \frac{0+(8.0~kg)(18~cm)}{76~kg}$
$x_{com} = 1.9~cm$
The location of the center of mass is $1.9~cm$ in front of the hips.