What is the average Points For when there are Points Against more than 780, and Points smaller than 0?
CREATE TABLE table_40768 (
    "Club" text,
    "Wins" real,
    "Losses" real,
    "Points For" real,
    "Points Against" real,
    "Percentage" real,
    "Points" real
)
SELECT AVG("Points For") FROM table_40768 WHERE "Points Against" > '780' AND "Points" < '0'
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 Points For when there are Points Against more than 780, and Points smaller than 0? ### Input: CREATE TABLE table_40768 (
    "Club" text,
    "Wins" real,
    "Losses" real,
    "Points For" real,
    "Points Against" real,
    "Percentage" real,
    "Points" real
) ### Response: SELECT AVG("Points For") FROM table_40768 WHERE "Points Against" > '780' AND "Points" < '0'