CREATE TABLE table_70282 ("Year" TEXT, "Record [a ]" TEXT, "Win %" FLOAT, "League [b ]" TEXT, "Division [c ]" TEXT, "GB [d ]" TEXT, "Post-season record [e ]" TEXT, "Post-season win %" TEXT, "MLB affiliate [f ]" TEXT)

What is the average win percentage of a season with a GB of 5?
SELECT AVG("Win %") FROM table_70282 WHERE "GB [d ]" = '5'
SELECT AVG("Win %") FROM "table_70282" WHERE "GB [d ]" = '5'