CREATE TABLE table_53819 ("Code" FLOAT, "Type" CLOB, "Name" CLOB, "Area  ( km 2  ) " FLOAT, "Population" FLOAT, "Regional County Municipality" CLOB, "Region" FLOAT)

What is the average area for code 98030 with population over 312?
SELECT AVG("Area (km 2 )") FROM table_53819 WHERE "Code" = '98030' AND "Population" > '312'
SELECT AVG("Area (km 2 )") FROM "table_53819" WHERE "Code" = '98030' AND "Population" > '312'