Learn how running totals differ from rates of change through parcel deliveries....

https://www.bookmarking-presto.win/totals-add-up-what-has-happened-rates-show-how-fast-it-happens-for-parcels

Learn how running totals differ from rates of change through parcel deliveries. “120 parcels by noon” is a total, while “15 parcels per hour from 10 to 11” is a rate. See how units and time windows clarify what each number means.