![]() You can think of a z-score as the number of standard deviations there are between a given value and the mean of the set. ![]() Z-scores are related to the Empirical Rule from the standpoint of being a method of evaluating how extreme a particular value is in a given set. It is worth noting, particularly for US students, that the instructor uses the notation x rather than µ for mean, and pronounces z as “zed.” The British video below is very clear and easy to follow.
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