What is the average area in New York that is larger than 55 sq mi?
CREATE TABLE "islands_under_square_miles_km" (
  "island_s_name" text,
  "area_sq_mi" real,
  "area_km_2" real,
  "location" text,
  "population_2000" text
);
SELECT AVG("area_km_2") FROM "islands_under_square_miles_km" WHERE "area_sq_mi">55 AND "location"='new york';