Find the Average Value of F(x, Y, Z) Over the Given

Multiple Choice

Find the average value of F(x, y, z) over the given region.
- $F ( x , y , z ) = x ^ { 2 } + y ^ { 2 } + z ^ { 2 }$ over the cube in the first octant bounded by the coordinate planes and the planes $x = 5$ ,
$$y = 5 , z = 5$$

A) 75
B) 5
C) 50
D) 25