Running totals track what adds up, while rates show how fast it changes. With...

https://activecalculus.org/author/Running-Totals-Rates-of-Change

Running totals track what adds up, while rates show how fast it changes. With parcels and rain, learn to read units and time windows: parcels per hour vs. parcels this week, or rain per day vs. rain this month. Make work charts easier to read clearly.