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SELECT T1.CONTINENT , FLOOR(AVG(T2.POPULATION)) AS AVERAGE_POPULATION
FROM COUNTRY AS T1
JOIN CITY AS T2
ON T1.CODE = T2.COUNTRYCODE
GROUP BY T1.CONTINENT
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Average Population of Each Continent
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SELECT T1.CONTINENT , FLOOR(AVG(T2.POPULATION)) AS AVERAGE_POPULATION FROM COUNTRY AS T1 JOIN CITY AS T2 ON T1.CODE = T2.COUNTRYCODE GROUP BY T1.CONTINENT