See how a running total differs from a rate of change with parcel deliveries....

https://papa-wiki.win/index.php/How_Do_I_Spot_When_Someone_Is_Treating_Totals_and_Rates_as_Interchangeable%3F

See how a running total differs from a rate of change with parcel deliveries. Compare parcels delivered so far with parcels per hour, and see how the time window and units change what a chart tells you.