What is the average enrollment number?
CREATE TABLE college (
    cname text,
    state text,
    enr number
)

CREATE TABLE player (
    pid number,
    pname text,
    ycard text,
    hs number
)

CREATE TABLE tryout (
    pid number,
    cname text,
    ppos text,
    decision text
)
SELECT AVG(enr) FROM college
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 enrollment number? ### Input: CREATE TABLE college (
    cname text,
    state text,
    enr number
)

CREATE TABLE player (
    pid number,
    pname text,
    ycard text,
    hs number
)

CREATE TABLE tryout (
    pid number,
    cname text,
    ppos text,
    decision text
) ### Response: SELECT AVG(enr) FROM college