Your comment made me think of an interesting story and a funfact. During WW2, allies tried to guess the number of German tanks by observing the serial numbers

Your comment made me think of an interesting story and a funfact. During WW2, allies tried to guess the number of German tanks by observing the serial numbers on captured tanks. https://en.m.wikipedia.org/wiki/German_tank_problem https://en.m.wikipedia.org/wiki/German_tank_problem If, say, the serial numbers are unique, and come in sequence, if the five first numbers you see are all less than 100, it's a far chance that there aren't produced 200 tanks. (Provided some assumptions, of course.) The funfact is that you get different results if you follow the frequentist or the Bayesian approach.