# Z-Score (Or Standard Score) of a Datum

## Z-Score (Or Standard Score) of a Datum

Statistical characteristic of a statistical datum x equal to $$\dfrac {x-\overline{x}} {\sigma }$$, where $$\overline{x}$$ is the arithmetic mean and σ is the standard deviation of the statistical series.

The Z-score corresponds to the number of standard deviations separating a result from the mean.

This score is one of the coordinates primarily used to assess student performance at the college level by universities.