What is the average grid for Marco Andretti with a finishing position higher than 19?
CREATE TABLE table_61629 (
    "Fin. Pos" real,
    "Car No." real,
    "Driver" text,
    "Team" text,
    "Laps" real,
    "Time/Retired" text,
    "Grid" real,
    "Laps Led" real,
    "Points" text
)
SELECT AVG("Grid") FROM table_61629 WHERE "Driver" = 'marco andretti' AND "Fin. Pos" > '19'
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 grid for Marco Andretti with a finishing position higher than 19? ### Input: CREATE TABLE table_61629 (
    "Fin. Pos" real,
    "Car No." real,
    "Driver" text,
    "Team" text,
    "Laps" real,
    "Time/Retired" text,
    "Grid" real,
    "Laps Led" real,
    "Points" text
) ### Response: SELECT AVG("Grid") FROM table_61629 WHERE "Driver" = 'marco andretti' AND "Fin. Pos" > '19'