This article shows how a running total differs from a rate of change, using...

https://www.golf-bookmarks.win/running-totals-and-rates-answer-different-questions-how-many-parcels-have

This article shows how a running total differs from a rate of change, using parcels as an example. See how units like parcels and parcels per hour, plus the time window you choose, help you read a shipping chart and avoid mixing a total with a pace.