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SELECT b1.CONTINENT,FLOOR(AVG(a1.POPULATION)) FROM CITY a1 INNER JOIN COUNTRY b1 ON a1.CountryCode = b1.Code GROUP BY b1.CONTINENT
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Average Population of Each Continent
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SELECT b1.CONTINENT,FLOOR(AVG(a1.POPULATION)) FROM CITY a1 INNER JOIN COUNTRY b1 ON a1.CountryCode = b1.Code GROUP BY b1.CONTINENT