单词：observed number
observed number的用法和样例：
例句
- In other words, an estimate is a specific observed value of a statistic.就是说，估计值是指统计量的一个具体观察值。
- A frequency distribution shows the number of observations from the data set that fall into each of the classes.频率分布反映出落入每一组的观察值个数。
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