 The mediocrity principle implies that Earth-like environments are necessarily common, based in part on the evidence of any happening at all, whereas the anthropic principle suggests that no assertion can be made about the probability of intelligent life based on a sample set of one (self-described) example, who are necessarily capable of making such an assertion about themselves.It is also possible to handle the Mediocrity Principle as a statistical problem, a case of a single Data point statistics, also present in the German tank problem.David Deutsch argues that the mediocrity principle is incorrect from a physical point of view, in reference to either humanity's part of the universe or to its species.