CREATE TABLE table_6377 ("Year" TEXT, "Team" TEXT, "Attempts" TEXT, "Completions" TEXT, "Completion %" TEXT, "Yards" TEXT)

which Completion % has a Yards of 2,175?
SELECT "Completion %" FROM table_6377 WHERE "Yards" = '2,175'
SELECT "Completion %" FROM "table_6377" WHERE "Yards" = '2,175'