A superposition of?

In statistical mechanics there's a concept of "ensemble average" and its provable that if you have a system, the average state of the system over say a 100 realisations ("ensemble average") run for 1 second each, is equal to the the average of one system run for a 100 seconds - under some assumptions of course.

I don't know enough a about human biology to make a statement about whether any of those assumptions will hold true, but maybe someone else will.