http://en.wikipedia.org/wiki/Standard_normal_table standard normal table Z-tables Standard normal table - Wikipedia There are many different conventions used Z-Scores https://en.wikipedia.org/wiki/Standard_normal_table Z-Scores http://en.wikipedia.org/wiki/Standard_normal_table Z-tables different forms of the Z-table standard normal table There are many different conventions used online standard normal table Z-score standard normal table Cumulative Standard Normal Probability