Database: university
Question: How many female students were there in Pierre and Marie Curie University in 2015?
SQL: SELECT CAST(T1.num_students * T1.pct_female_students AS REAL) / 100 FROM university_year AS T1 INNER JOIN university AS T2 ON T1.university_id = T2.id WHERE T1.year = 2015 AND T2.university_name = 'Pierre and Marie Curie University'