CREATE TABLE table_name_83 (lane NUMBER, time VARCHAR2, nationality VARCHAR2)

Which Lane has a Time larger than 20.5, and a Nationality of trinidad and tobago?
SELECT AVG(lane) FROM table_name_83 WHERE time > 20.5 AND nationality = "trinidad and tobago"
SELECT AVG("lane") FROM "table_name_83" WHERE "nationality" = "trinidad and tobago" AND "time" > 20.5