Learn how a running total differs from a rate of change with parcel counts: 240...

https://delta-wiki.win/index.php/What_Does_A(t)_Mean_in_Plain_English_for_a_Running_Total%3F

Learn how a running total differs from a rate of change with parcel counts: 240 parcels delivered by noon is a total, while 30 parcels per hour from 10 to 11 a.m. is a rate. Units and time windows make dashboard numbers easier to read.