Question: What is the average Area (in km²), when Markatal is less than 0?
SQL: SELECT AVG("Area (in km²)") FROM "2-16278673-1" WHERE "Markatal" < 0.0;

Question: What is the highest Markatal, when Municipality is leirvík, and when Inhabitants Per Km² is greater than 79?
SQL: SELECT MAX("Markatal") FROM "2-16278673-1" WHERE "Municipality" = 'leirvík' AND "Inhabitants per km²" > 79.0;

Question: What is the sum of Population, when Markatal is greater than 48, when Inhabitants Per Km² is greater than 24, and when Municipality is Runavík?
SQL: SELECT SUM("Population") FROM "2-16278673-1" WHERE "Markatal" > 48.0 AND "Inhabitants per km²" > 24.0 AND "Municipality" = 'Runavík';

Question: What is the sum of Markatal, when Inhabitants Per Km² is less than 13, and when Area (in Km²) is 27?
SQL: SELECT SUM("Markatal") FROM "2-16278673-1" WHERE "Inhabitants per km²" < 13.0 AND "Area (in km²)" = 27.0;