4 ms·

This is true by default, the other depends on the distribution.

• the8472 7y ago
  Since intelligence must be a one-sided distribution it's probably right-tailed, which means the mean is higher than the median. So I expect (slightly) more than half of the population to be dumber than average.
  • alasdair_ 7y ago
    >Since intelligence must be a one-sided distribution it's probably right-tailed, which means the mean is higher than the median. There are a lot of people with physical injuries or disabilities that skew things to the left.
    • the8472 7y ago
      Those are all small, independent random contributions that naively would lead to a normal distribution per the central limit theorem. But it can't be quite a normal distribution due to the lower bound of 0 (in terms of absolute intelligence, not IQ). A better candidate would be a log-normal distribution which is always right-skewed.