A more thorough explanation:

The American Experience Table of Mortality is a chart that was created by insurance companies in the 1860s. Its purpose was to help predict mortality rates so that insurance rates could be set more accurately.

For example, if the table predicted that a certain group of people had a higher risk of death, then insurance rates for that group would be higher.

The Table was widely used by insurers until the 1950s.

Overall, the American Experience Table of Mortality helped insurance companies to better understand the risks associated with different groups of people, and to set rates that were more fair and accurate.