CREATE TABLE table_7127 ("Track" FLOAT, "Recorded" TEXT, "Catalogue" TEXT, "Release date" TEXT, "Chart peak" TEXT, "Song title" TEXT, "Writer ( s ) " TEXT, "Time" TEXT)

Which Track has a Writer(s) of mac davis?
SELECT AVG("Track") FROM table_7127 WHERE "Writer(s)" = 'mac davis'
SELECT AVG("Track") FROM "table_7127" WHERE "Writer(s)" = 'mac davis'