The left axis shows the probability, or relative frequency of occurrence, of various Chi Square values.
纵轴显示各 X 平方分布值的概率（或称为出现的相对频率）。
There are two forms of statement about the definition of probabilities. according to the first statement that a relative frequency is a probability;
概率的定义有两种稍微不同的陈述方式，按照第一种陈述，相对频率就是概率；
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