在初中阶段,学生已经学习和了解了必然事件、不可能事件和随机事件等概率论的一些基本概念。所谓概率论,是研究随机性或不确定性等现象的数学,它是数学的一个分支;更精确地说,概率论是用来模拟实验在同一环境下会产生不同结果的可能性。 At the junior high school stage, students have learned and understood some basic concepts of probability theory such as inevitable events, impossible events and random events. Probability theory is a mathematical study of randomness or uncertainty. It is a branch of mathematics. More precisely, probability theory is used to simulate the possibility that experiments will produce different results in the same environment.