What is the average Margin that has a Round of 13. (h)?
CREATE TABLE table_50898 (
    "Round" text,
    "St Kilda Saints" text,
    "Opposition" text,
    "Their Score" text,
    "Margin" real
)
SELECT AVG("Margin") FROM table_50898 WHERE "Round" = '13. (h)'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the average Margin that has a Round of 13. (h)? ### Input: CREATE TABLE table_50898 (
    "Round" text,
    "St Kilda Saints" text,
    "Opposition" text,
    "Their Score" text,
    "Margin" real
) ### Response: SELECT AVG("Margin") FROM table_50898 WHERE "Round" = '13. (h)'