What is the mean number of laps when the grid is less than 19 and time/retired is +21.3 secs?
CREATE TABLE table_name_56 (
    laps INTEGER,
    grid VARCHAR,
    time_retired VARCHAR
)
SELECT AVG(laps) FROM table_name_56 WHERE grid < 19 AND time_retired = "+21.3 secs"
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 mean number of laps when the grid is less than 19 and time/retired is +21.3 secs? ### Input: CREATE TABLE table_name_56 (
    laps INTEGER,
    grid VARCHAR,
    time_retired VARCHAR
) ### Response: SELECT AVG(laps) FROM table_name_56 WHERE grid < 19 AND time_retired = "+21.3 secs"