CREATE TABLE table_51450 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

How many people attended Melbourne's away game?
SELECT SUM("Crowd") FROM table_51450 WHERE "Away team" = 'melbourne'
SELECT SUM("Crowd") FROM "table_51450" WHERE "Away team" = 'melbourne'