Of the games that sold 321,000 units in the UK, what is their average place?
CREATE TABLE table_31688 (
    "Place" real,
    "Title" text,
    "Units sold in Japan" text,
    "Units sold in the UK" text,
    "Units sold in the US" text,
    "Total units sold" real
)
SELECT AVG("Place") FROM table_31688 WHERE "Units sold in the UK" = '321,000'
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: Of the games that sold 321,000 units in the UK, what is their average place? ### Input: CREATE TABLE table_31688 (
    "Place" real,
    "Title" text,
    "Units sold in Japan" text,
    "Units sold in the UK" text,
    "Units sold in the US" text,
    "Total units sold" real
) ### Response: SELECT AVG("Place") FROM table_31688 WHERE "Units sold in the UK" = '321,000'