What was the world rank by QS in 2013 for the University of Otago?
create table table_27484208_1 (world_rank_by_qs_ varchar, _2013 varchar, members varchar, PRIMARY KEY (world_rank_by_qs_))
select world_rank_by_qs_, _2013 from table_27484208_1 where members = "university of otago"