Table: nashville_metros_stats_2
Columns: year
division
league
regular_season
playoffs
open_cup

Question: What year did the Nashville Metros have the Regular Season 2nd, central?
SQL: SELECT "year" FROM nashville_metros_stats_2 WHERE "regular_season" = '2nd, central'

Question: What division did the Nashville Metros play in during the year that they did not qualify for the Playoffs, where in the USL PDL League, and had the Regular Season 7th, Southeast?
SQL: SELECT "division" FROM nashville_metros_stats_2 WHERE "playoffs" = 'did not qualify' AND "league" = 'usl pdl' AND "regular_season" = '7th, southeast'

Question: What was the average year that the Nashville Metros did not qualify for the Playoffs, did not qualify for the Open Cup, and had the Regular Season 7th, Southeast?
SQL: SELECT AVG("year") FROM nashville_metros_stats_2 WHERE "playoffs" = 'did not qualify' AND "open_cup" = 'did not qualify' AND "regular_season" = '7th, southeast'