Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE phone (chip_model VARCHAR, Company_name VARCHAR); CREATE TABLE chip_model (ROM_MiB INTEGER, Model_name VARCHAR)
### Question:
What is the average ROM size of phones produced by the company named "Nokia Corporation"?
### Answer:
SELECT AVG(T1.ROM_MiB) FROM chip_model AS T1 JOIN phone AS T2 ON T1.Model_name = T2.chip_model WHERE T2.Company_name = "Nokia Corporation"