What is the mean number of laps for the constructor Ferrari when the time/retired was fuel pressure?
CREATE TABLE table_56884 (
    "Driver" text,
    "Constructor" text,
    "Laps" real,
    "Time/Retired" text,
    "Grid" real
)
SELECT AVG("Laps") FROM table_56884 WHERE "Constructor" = 'ferrari' AND "Time/Retired" = 'fuel pressure'
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 for the constructor Ferrari when the time/retired was fuel pressure? ### Input: CREATE TABLE table_56884 (
    "Driver" text,
    "Constructor" text,
    "Laps" real,
    "Time/Retired" text,
    "Grid" real
) ### Response: SELECT AVG("Laps") FROM table_56884 WHERE "Constructor" = 'ferrari' AND "Time/Retired" = 'fuel pressure'