As things stand, the probablility that we win the title is very high, say 0,8, but it's not 1.
The probability for our title win back in 2012 with 6 games to go was extremely low but we won it. So, the calculations in this thread may make you feel less anxious but they do not guarantee the title. Remember that the probability of Liverpool failing to win 5 consecutive games at Anfield with scoring just 2 goals in those 5 games was incredibly low back in December.
That said, I think that even 78 pts will be enough for the title, especially IF United drop 5 pts over the next 4 games. Think also that we are likely to go to 88+ pts. But it's all about probabilities which can widely fluctuate after two poor results in a row.
Still, if we win the next 5 games, we are champions 99 %.