Write SQL query to solve given problem: What is the student population of the university that scored 98 in 2013?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT SUM(T1.num_students) FROM university_year AS T1 INNER JOIN university_ranking_year AS T2 ON T1.university_id = T2.university_id WHERE T2.score = 98 AND T1.year = 2013