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This study aims to analyze the difficulties experienced by students and teachers, especially in statistical materials and offered alternative solutions. The method used in this study used a qualitative approach with a descriptive type. The subjects in this study were 32 students of class XI IPA and a mathematics teacher at SMA ADVENT Purwodadi Malang. The results showed that the teacher had difficulty explaining the statistical material in group data. The difficulties faced by the teacher were caused by students who had difficulty in applying the group data formula. The difficulties faced by students vary, including understanding concepts (misconceptions), formulation (error in principle), modeling (fact errors), and calculation operations (operating errors). The difficulties experienced by the students resulted in the difficulty level of the questions. The problems given fall into the medium and easy criteria. An alternative solution is offered, that is, when learning for statistics material, it can use a problem-based learning model.AbstrakPenelitian ini bertujuan untuk menganalisis kesulitan yang dialami peserta didik dan guru khususnya pada materi statistika serta solusi alternative yang ditawarkan. Metode yang digunakan dalam penelitian ini menggunakan pendekatan kualitatif dengan jenis deskriptif. Subjek dalam penelitian ini yaitu Peserta didik kelas XI IPA dengan jumlah 32 peserta didik dan seorang guru matematika di SMA ADVENT Purwodadi Malang. Hasil Penelitian menunjukan bahwa guru mengalami kesulitan saat menjelaskan materi statistika pada data kelompok. Kesulitan yang dihadapi guru disebabkan oleh peserta didik yang kesulitan pada penerapan rumus data kelompok. Kesulitan yang dihadapi Peserta didik beragam diantaranya pemahaman konsep (kesalahan konsep), perumusan (kesalahan prinsip), pemodelan (kesalahan fakta), serta oprasi hitung (kesalahan operasi). Kesulitan yang dialami oleh perseta didik berakibatkan pada tingkat kesukaran soal. Pers

This study aims to identify the types of students’ thinking in solving mathematical problems in terms of mathematical abilities between high, medium, and low. The method that used in this research is a descriptive qualitative approach. Data is obtained from the results of written tests and interviews. The subjects of the study six students consisting of two high-capacity students, two medium-capacity students and two low-ability students in grades VIII-5 at SMPN 5 Tarakan, North Kalimantan. The data analysis was done of triangulation data using document analysis results and analysis of interview transcripts. The results of the study indicate that there are differences in the types of thinking of high, medium and low ability students. In this type of high-ability learners thinking in problem solving using a type of conceptual thinking that is the type of thinking that the way to solve the problem using a concept that has been owned of learning outcomes. While the type of thinking learners medium and low ability to solve problems that no decision could be made, because the indicator filled not located on the same kind of thought process.Abstrak   Penelitian ini bertujuan untuk mengidentifikasi tipe berpikir peserta didik dalam memecahkan masalah matematika ditinjau dari kemampuan matematika diantara tinggi, sedang, dan rendah. Metode yang digunakan dalam penelitian ini adalah pendekatan kualitatif yang berjenis deskriptif. Data yang diperoleh dari hasil tes tertulis dan wawancara. Subjek penelitian adalah enam orang peserta didik terdiri dari dua peserta didik berkemampuan tinggi, dua peserta didik berkemampuan sedang dan dua peserta didik berkemampuan rendah pada kelas VIII-5 di Sekolah Menengah Pertama Negeri 5 Tarakan, Kalimantan Utara. Analisis data yang dilakukan yaitu triangulasi data dengan menggunakan hasil analisis dokumen dan analisis transkrip wawancara. Hasil dari penelitian menunjukkan bahwa terdapat perbedaan pada tipe berpikir peserta di