This study aimes to investigate the effect of the Problem-Centered Learning strategy in teaching the concepts of statistics and probability on grade eight student's achievement and developing their statistical thinking skills. The sample of the study consisted of (62) female students from Rustaq School. This sample was divided into two groups: experimental group and control group, both of them consisted of (31) students. The experimental group studied statistics and probability unit using Problem-Centered Learning strategy, while the control group studied the same unit by using the traditional method. The study found the following results: 1 - There are differences of statistical significance, at the level of (a- 0.05) between the average degree of experimental group students, and the average degree of the control group in the postachievement test, in favor of the experimental group. 2- There are differences of statistical significance, at the level of (a -0.05) between the average of degree of the experimental group, and the average of degree of the control group in the post statistical thinking test, in favor of the experimental group.In light of the above results, the study ended with some recommendations such as: design Mathematics curriculum in all grades based on the Problem-Centered Learning strategy and design professional development programs for supervisors and teachers on how to employ this strategy, and train students to develop statistical thinkingskills in classes.