Mean Learning with Problem Based Learning to Improve Problem Solving Ability of Junior High School Students

Problem-solving ability is a core competency in mathematics education that students must acquire to meet the demands of the 21st century. This study aims to evaluate the effectiveness of the Problem-Based Learning (PBL) model in improving students' mathematical problemsolving skills, focusing on the topic of statistics, specifically the concept of the mean. The research was conducted with 30 students in grade VIII F at SMP Negeri 3 Yogyakarta. A quantitative approach was employed using a one-group pretest-posttest design. Research instruments included problem-solving tests, observation sheets, and documentation. The findings reveal a significant improvement in students' problem-solving skills after the implementation of the PBL model, with the mean pretest score increasing from 68.33 to 78.30 in the posttest