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

https://www.nav-bookmarks.win/totals-add-up-what-has-happened-rates-show-how-fast-it-happens-for-parcels

A running total tells you how many parcels have arrived so far, while a rate of change shows how many arrive per hour. This article explains how units and time windows help you tell those numbers apart and use them with confidence.