I think it should be Law of Large Numbers. It is a principle of probability and statistics which states that as a sample size grows, its mean will get closer and closer to the average of the whole population.

Added 3/28/2014 8:43:35 PM

This answer has been confirmed as correct and helpful.

Confirmed by debnjerry [3/28/2014 8:45:02 PM], Rated good by jeifunk

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