By Alan Smith If statistics are meant to be a firm guide of what should happen in a game, then this afternoon’s FA Cup quarter-final at Old Trafford will only end one way. Liverpool, chasing four trophies in Jurgen Klopp ’s final season, make the short trip east as overwhelming favourites to pile fresh misery on an inconsistent Manchester United. And the data from this season of contrasting fortunes points to a bombardment on Andre Onana’s goal. Klopp’s side are on pace to set a record for shots in a Premier League season since such data was recorded by fbref.com a decade ago. They have alread…