CREATE TABLE table_203_292 (id DECIMAL, "payload type  ( pt ) " TEXT, "name" TEXT, "type" TEXT, "no. of channels" TEXT, "clock rate  ( hz ) " TEXT, "frame size  ( ms ) " TEXT, "default packet size  ( ms ) " TEXT, "description" TEXT, "references" TEXT)

what is the average number of channels ?
SELECT "no. of channels" FROM table_203_292 GROUP BY "no. of channels" ORDER BY COUNT(*) DESC LIMIT 1
SELECT "no. of channels" FROM "table_203_292" GROUP BY "no. of channels" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1