CREATE TABLE table_16048129_5 (number_of_people INT, average_family_size VARCHAR)

What is the largest population in regions where the average family size is 2.8 people?
SELECT MAX(number_of_people) FROM table_16048129_5 WHERE average_family_size = "2.8"
SELECT MAX("number_of_people") FROM "table_16048129_5" WHERE "2.8" = "average_family_size"