One roll of the dice would tell you very little, but the more times you rolled them, the more data you collected, the more confident you would become, not just whether they're loaded or fair, but by how much, and in what way.
Jedno bacanje kockice  reklo bi vam jako malo, ali što biste ih više bacali, više podataka biste imali te biste postajali sve uvjereniji ne samo u to jesu li  namještene ili ispravne nego i koliko i na koji način.