What is the average points of a Cosworth v8 engine in 1973.
CREATE TABLE table_68928 (
    "Year" real,
    "Entrant" text,
    "Chassis" text,
    "Engine" text,
    "Points" real
)
SELECT AVG("Points") FROM table_68928 WHERE "Engine" = 'cosworth v8' AND "Year" = '1973'
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 of a Cosworth v8 engine in 1973. ### Input: CREATE TABLE table_68928 (
    "Year" real,
    "Entrant" text,
    "Chassis" text,
    "Engine" text,
    "Points" real
) ### Response: SELECT AVG("Points") FROM table_68928 WHERE "Engine" = 'cosworth v8' AND "Year" = '1973'