Calculate the percentage of female actors and quality 2 who have appeared twice at the casting of the film 1672580.
Female actors mean that a_gender = 'F'; percentage can be computed by [cast_num = 2 AND a_quality = 2 in female) / (all female actors)] * 100%
SELECT CAST(SUM(IIF(T2.cast_num = 2 AND T1.a_quality = 2, 1, 0)) AS REAL) * 100 / COUNT(T1.actorid) FROM actors AS T1 INNER JOIN movies2actors AS T2 ON T1.actorid = T2.actorid WHERE T2.movieid = 1672580 AND T1.a_gender = 'F'