Is the mean free path the mean of a distribution?

Steve T. Paik
2014 American Journal of Physics  
We bring attention to the fact that Maxwell's mean free path for a dilute hard-sphere gas in thermal equilibrium, $(\sqrt{2}\sigma n)^{-1}$, which is ordinarily obtained by multiplying the average speed by the average time between collisions, is also the statistical mean of the distribution of free path lengths in such a gas.
doi:10.1119/1.4869185 fatcat:xm2l56ylfrendcdmnhqwwvhd3m