What is the mean Fall 09 number where fall 05 is less than 3?
CREATE TABLE "geography_of_students" (
  "states" text,
  "fall_05" real,
  "fall_06" real,
  "fall_07" real,
  "fall_08" real,
  "fall_09" real
);
SELECT AVG("fall_09") FROM "geography_of_students" WHERE "fall_05"<3;