Expected IQ Spread on a Jury
In a randomly selected jury of 12 people, the expected highest IQ is about 117 and the lowest about 83, giving a spread of roughly 34 points, based on a normal distribution with mean 100 and standard deviation 15.
Related stories
A blog post examines the expected IQ spread among members of a jury, relating it to discussions about how large IQ differences can hinder communication between people.
This post examines how to compute the expected range of n samples drawn from a standard normal distribution N(0,1). The results are given in units of σ, so they can be scaled for other standard deviations.