"f" is uniformly distributed on (0, 1) even after learning of the absolute position "n". That is, for example, there is a 95% chance that "f" is in the interval (0.05, 1), that is "f" > 0.05. In other words, we could assume that we could be 95% certain that we would be within the last 95% of all the humans ever to be born. If we know our absolute position "n", this argument implies a 95% confident upper bound for "N" obtained by rearranging "n"/"N" > 0.05 to give "N" < 20"n".