z-Score
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A z-score, also called a "standard score," is the difference from the mean divided by the standard deviation.
Z-score is a college-level concept that would be first encountered in a probability and statistics course. It is an Advanced Placement Statistics topic.
Prerequisites
| Arithmetic Mean: | Arithmetic mean is a synonym for average, i.e., the sum of all values in a list divided by the number of values present. |
| Standard Deviation: | The standard deviation is a statistic defined as the square root of the variance that measures how spread out a set of data is. |