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人教A版《数学3》(必修)中学习了用样本的数字特征估计总体的数字特征,主要是利用初中学习的众数、中位数、平均数等知识估计总体的数字特征。其中在频率分布直方图中如何估计中位数的方法是个难点,但教材中没有明确指出如何求解,在练习时学生很难理解,无法求出具体值。本文从中位数的概念出发,就如何在频率分布直方图中估计中位数的值进行了探究并得出求解公式,供读者参考。
People teach A version of “Mathematics 3” (compulsory) to learn the digital characteristics of the sample to estimate the overall digital features, mainly by using the mode of junior high school learning, median, average and other knowledge to estimate the overall digital characteristics. Among them, how to estimate the median in the histogram of frequency distribution is a difficult problem, but the textbook does not indicate how to solve it. It is hard for students to understand and can not find the concrete value in practice. Based on the concept of median, this paper explores how to estimate the median value in the histogram of frequency distribution, and obtains the solution formula for readers’ reference.