Summarized By Options and Definitions

Can someone point me to documentation on the “Summarize” options in reports?

When creating a chart in a Workfront report, the user is required to select an option for “Summarized By”. In most cases there are two choices: Minimum and Maximum. What do these mean and how are they different? What other options exist and what are their meanings? I’ve see Count, Sum, and Average on column settings as well. I haven’t been able to find anything in the Workfront documentation.