If United win their last 8 games, they will be guaranteed at least 2nd place with 83 points (would pass City and Arsenal by beating them).
Chelsea (currently on 67 points with 9 games to go) would need to draw 1 and lose 3 of their last 9 (with 1 of those being United).
Looking through Chelsea's remaining fixtures, the three best possibilities for those other results would be Arsenal (A), Liverpool (H), or a random slip up away from Stamford Bridge somewhere (almost happened today).
Of course all of it is very unlikely, but I haven't thrown my Vegas ticket away yet because math.
