The 128 should be the denominator. My instructor wants me to find the average days late for each vendor out of the entire amount of days late. The answer I have right now is -0.26667, and I need -.03. I am sure there are other ways I can come to this answer, but for the the project, I have to use the daverage function.

I'm really not sure what to do. Do I try to make a table? Filter results? Use a sum function???? AHHH