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

https://www.fastbookmarks.win/this-article-shows-how-running-totals-differ-from-rates-of-change-using-parcel

A running total tells you how many parcels have arrived so far; a rate tells you how many arrive per hour. This article shows how to read both, keep units straight, and choose the right time window when comparing a busy morning with a slower afternoon.