CREATE TABLE table_55957 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What was the average amount of spectators when the away team scored 14.7 (91)?
SELECT AVG("Crowd") FROM table_55957 WHERE "Away team score" = '14.7 (91)'
SELECT AVG("Crowd") FROM "table_55957" WHERE "Away team score" = '14.7 (91)'