Database: european_football_2
Question: Calculate the average home team goal in the 2010/2011 season in the country of Poland.
SQL: SELECT CAST(SUM(t2.home_team_goal) AS REAL) / COUNT(t2.id) FROM Country AS t1 INNER JOIN Match AS t2 ON t1.id = t2.country_id WHERE t1.name = 'Poland' AND t2.season = '2010/2011'