What does 'Expected Goals' mean?

http://www.mirror.co.uk/sport/football/news/what-expected-goals-mean-welcome-10978290
What does 'Expected Goals' mean? Welcome to the new Opta stat you will be hearing a lot about this season
With Match of the Day now making use of Opta's new 'expected goals' stat, we explain the numbers which tell us exactly how many goals a player SHOULD have scored

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