question: What is the average 2007 value with a 2009 value greater than 2.8, a 4.9 in 2010, and a 2006 less than 2.5?
answer: SELECT AVG(2007) FROM table_name_19 WHERE 2009 > 2.8 AND 2010 = 4.9 AND 2006 < 2.5
context: CREATE TABLE table_name_19 (Id VARCHAR)