Find the average ram mib size of the chip models that are never used by any phone.
CREATE TABLE chip_model (
    RAM_MiB INTEGER,
    model_name VARCHAR,
    chip_model VARCHAR
)

CREATE TABLE phone (
    RAM_MiB INTEGER,
    model_name VARCHAR,
    chip_model VARCHAR
)
SELECT AVG(RAM_MiB) FROM chip_model WHERE NOT model_name IN (SELECT chip_model FROM phone)
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: Find the average ram mib size of the chip models that are never used by any phone. ### Input: CREATE TABLE chip_model (
    RAM_MiB INTEGER,
    model_name VARCHAR,
    chip_model VARCHAR
)

CREATE TABLE phone (
    RAM_MiB INTEGER,
    model_name VARCHAR,
    chip_model VARCHAR
) ### Response: SELECT AVG(RAM_MiB) FROM chip_model WHERE NOT model_name IN (SELECT chip_model FROM phone)