在随机变量数学期望的教学实践中，创设情景案例激发学生学习兴趣，调动学生互动学习，通过案例问题的深入研讨获得数学期望的概念，促进学生对数学期望本质的理解，最后，运用案例教学法将生活中的两个实际问题转化为求数学期望问题，不但可以以此来检验学生的学习效果，还可以提高学生理解、分析及解决问题的综合能力，从而实现提高教学效率与教学质量的最终目标。
In the teaching practice of mathematical expectation of random variables, a situational case is created to stimulate students’ interest in learning and mobilize students’ interactive learning. Then, the concept of mathematical expectation is obtained through indepth study of the situational case, which promotes students’ understanding of the nature of mathematical expectation. Finally, the case-based teaching is utilized to transform two practical problems into the issues of mathematical expectation, which can not only test students’ learning effect, but also improve students’ comprehensive ability of understanding, analyzing and solving problems, so as to achieve the ultimate goal of improving teaching efficiency and teaching quality.
