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

https://evelynsbrilliantthoughts.brightsora.com/posts/why-do-i-get-parcels-per-hour-instead-of-just-parcels

A running total tells how many parcels have arrived so far, while a rate tells how fast they arrive. Compare 120 parcels by noon with 15 parcels per hour, and see why the units and time window matter when reading a work chart at a glance.