Question: What is the total number of regions where the average family size is 2.8?
Schema: create table table_16048129_5 (_percentage_of_total_deportees varchar, average_family_size varchar, PRIMARY KEY (_percentage_of_total_deportees))
SQL: select count(_percentage_of_total_deportees) from table_16048129_5 where average_family_size = "2.8"