A running total tells you how many parcels have arrived so far, while a rate...

https://www.first-bookmarkings.win/see-how-a-running-total-differs-from-a-rate-of-change-using-parcels-arriving

A running total tells you how many parcels have arrived so far, while a rate tells you how quickly they’re coming in. This article compares both, with clear units and time windows so the numbers make sense on a real shift.