Find the center of mass of the tetrahedron 
in the first octant formed by the coordinate planes and the plane 
. (Assume the density is 
.)
Definitions:
Probability
A measure of the likelihood that an event will occur, expressed as a number between 0 and 1.
Standard Deviations
A measure of the amount of variation or dispersion of a set of values from the mean.
Z Score
A statistical measurement that describes a value's relationship to the mean of a group of values, expressed in standard deviations.
Mean
The arithmetic average of a set of numbers, calculated by dividing the sum of the numbers by the count of numbers in the set.
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