Djafar S, Ismail S, Usman K. The PBL Model in Statistics to Improve Eighth-Grade Students’ Mathematical Problem-Solving Skills . jpm unila [Internet]. 2026 Jun. 30 [cited 2026 Jul. 17];14(2):168-76. Available from: https://jurnal.pbs.fkip.unila.ac.id/index.php/jpm/article/view/1905