What is the percentage of female audiences who viewed movies with rating 2?
The audience and users are the same meaning; Female users refers to u_gender = 'F'; Percentage of female users = count(female users) / count(all users); count(all users) = count(female users) + count(male users)
SELECT CAST(SUM(IIF(T2.u_gender = 'F', 1, 0)) AS REAL) * 100 / COUNT(T2.userid) FROM u2base AS T1 INNER JOIN users AS T2 ON T1.userid = T2.userid WHERE T1.rating = 2