I haven't read the article below yet, but the findings in the abstract remind me of Condorcet's Jury Theorem, which uses math to show how a group (e.g. a jury) is more likely to reach a correct (and unbiased) decision compared to a single individual (e.g. a judge).
Gary Charness & Matthias Sutter
Journal of Economic Perspectives, Summer 2012, Pages 157–176