Average Line in Chart/Graph

@Nick_Milner My graph is generated based on a “Count” of rows per “Date”

In my data table, each row is an attendance record linked to people in my database and the date. How would I apply your “average” logic to my data table? Do I need a new table that takes the attendance table and summarizes the attendance amounts into per-date records? Then apply your method?

2019-05-08%2011_17_03-Bus%208%20Roster