Summary Quartiles are usually introduced early, often in primary school together with box-and-whisker plots. Various methods are used, and in lack of explanation in many textbooks at elementary level, this leads to unnecessary confusion. We discuss some elementary methods that are consistent with the most common definition and are also easy to understand.

中文翻译：

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计算四分位数的基本方法

总结四分位数通常很早就引入，通常在小学时与盒须图一起引入。使用的方法多种多样，许多初级教科书缺乏解释，导致不必要的混乱。我们讨论一些与最常见的定义一致且易于理解的基本方法。