CREATE TABLE table_4919 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What is the away team's score when north melbourne is the home team?
SELECT "Away team score" FROM table_4919 WHERE "Home team" = 'north melbourne'
SELECT "Away team score" FROM "table_4919" WHERE "Home team" = 'north melbourne'