Table schema:
CREATE TABLE table_name_71 (countries_sampled INTEGER, ranking_in_latin_america__2_ VARCHAR, year_of_publication VARCHAR, world_ranking__1_ VARCHAR)

Question: How many countries sampled has a world ranking of 33 in 2010 and less than 3 ranking in Latin America?
SQL: SELECT SUM(countries_sampled) FROM table_name_71 WHERE year_of_publication = "2010" AND world_ranking__1_ = "33" AND ranking_in_latin_america__2_ < 3