It's impossible to say, basically, because a LOT of culture depends on endgame events, how many turns the game lasts, and how aggressive people are. A lot like Dominion in that way. 40 is a great score with no alt. VPs, but if it's a Goons megaturn board, it looks pretty poor compared to your neighbours 150.
In the advanced game, I'd tailor your civilisation to your impact events, but also grab some from Libraries and/or Theaters (as well as any small trickles from things like Wonders, Temples etc). Occasionally you can pull of something crazy like Michelangelo+St. Peter's Basilica, but usually you're looking primarily at endgame events. And depending on what ones are there, anything from 40-100 is plausible.
In the Full game, things get even more insane. Because of Wars, you can have people producing very little culture, who just suddenly steal 30 from you in the last few turns. Or you might have four people scoring 15 per turn with a wad of Theaters and the like. And each Impact event is about 10-20 culture each on average, so if you get a game with lots of people drawing the right ones for themselves, and compare to an almost identical one where people draw lots of the wrong ones for themselves, the score can be different by an order of magnitude of over 100.
For reference, looking over my recently finished BGO games, I've won a 3 player game with 95 culture, and come 3rd of 4 with 197. Usually my score's in the 170-230 range though.