CREATE TABLE table_78026 ("Code" FLOAT, "Type" TEXT, "Name" TEXT, "Area  ( km 2  ) " FLOAT, "Population" FLOAT, "Regional County Municipality" TEXT, "Region" FLOAT)

What is the km2 area for the population of 311?
SELECT AVG("Area (km 2 )") FROM table_78026 WHERE "Population" = '311'
SELECT AVG("Area (km 2 )") FROM "table_78026" WHERE "Population" = '311'