Coronavirus Pandemic (COVID-19) Research and data: Hannah Ritchie, Edouard Mathieu, Lucas Rodés-Guirao, Cameron Appel, Charlie Giattino, Esteban Ortiz-Ospina, Joe Hasell, Bobbie MacDonald, Diana Beltekian, and Max Roser. Web development: Ernst van Woerden, Daniel Gavrilov, Marcel Gerber, Matthieu Bergel, and Jason Crawford.
This table is organized to provide the area under the curve to the left of or less of a specified value or "Z value". In this case, because the mean is zero and the standard deviation is 1, the Z value is the number of standard deviation units away from the mean, and the area is the probability of observing a value less than that particular Z value.