A possible statistical mechanism of anomalous neutrino velocity in OPERA experiment?

The set of kinetic equations describing the process of conversion of a beam of protons into mesons and then to neutrinos is solved. The asymptotic evolution of the density profile of neutrinos is essentially the same as that obtained in the previous version of the note for a simple model of uniformly damped wave-packet. It shows again that the recently reported "superluminal neutrinos" could be considered as a purely statistical effect due to the fact that the detected neutrinos represent a biased sample of initial protons.