Calculate the average number of disabled female students enrolled in UCI.
average = DIVIDE(SUM(disabled.name who are not in male.name WHERE school = 'uci'), COUNT(enrolled.name)); female students refers to disabled.name who are NOT in male.name; UCI refers to school = 'uci';
SELECT CAST(SUM(IIF(T1.school = 'uci' AND T4.name IS NULL, 1, 0)) AS REAL) / COUNT(T1.name) FROM enrolled AS T1 INNER JOIN disabled AS T2 ON T1.name = T2.name INNER JOIN person AS T3 ON T1.name = T3.name LEFT JOIN male AS T4 ON T3.name = T4.name