This article compares running totals with rates of change using a parcel...

https://www.insert-bookmark.win/see-how-a-running-total-adds-parcels-over-a-shift-while-a-rate-shows-parcels

This article compares running totals with rates of change using a parcel dashboard: total parcels delivered by Friday versus parcels per hour during Tuesday’s shift. It explains why units and time windows matter when you read either number.