Answer
The center of gravity for his entire body is located $1.03m$ above the floor.
Work Step by Step
The center of gravity is calculated by $$x_{cg}=\frac{W_1x_1+W_2x_2+W_3x_3}{W_1+W_2+W_3}$$
The total weight of head, upper torso, arms and hands is $W_1=438N$ and its center of gravity $x_1=1.28m$
The total weight of the upper legs is $W_2=144N$, and the center of gravity $x_2=0.76m$
The total weight of lower legs and feet is $W_3=87N$, and its center of gravity is $x_3=0.25m$
Therefore, $$x_{cg}=1.03m$$
