Condorcet's jury theorem

Abstract

Condorcet’s jury theorem investigates the dependence between the number of voters in a group and the probability that the group will make a correct decision by the majority vote. The probability of a correct decision increases as the size of the group grows if the individual probability of a correct vote is more than one-half. However, if that probability is less than half, adding more voters worsens the situation, meaning even a single voter is better than a group. – AI-generated abstract.