What are your intuitions about this? It has direct implications for whether the Simulation Argument is sound.
Imagine two rooms, A and B. Between times t1 and t2, 100 trillion people sojourn in room A while 100 billion sojourn in room B. At any given moment, though, exactly 1 person occupies room A while 1,000 people occupy room B. At t2, you find yourself in a room, but you don't know which one. If you have to place a bet on which room it is (at t2), what do you say? Do you consider the time-slice or the history of room occupants? How do you place your bet?
If you bet that you're in room B, then the Simulation Argument may be flawed: there could be a fourth disjunct that Bostrom misses, namely that we become a posthuman civilization that runs a huge number of simulations yet we don't have reason for believing that we're stimulants.