Calculate the percentage of members who are major Mathematics in the list?
DIVIDE(SUM(position = 'Member' and major_name = 'Mathematics'), COUNT(member_id)) * 100
SELECT CAST(SUM(CASE WHEN T2.major_name = 'Mathematics' THEN 1 ELSE 0 END) AS REAL) * 100 / COUNT(T1.member_id) FROM member AS T1 INNER JOIN major AS T2 ON T2.major_id = T1.link_to_major WHERE T1.position = 'Member'