I need to automate a rolling 3-round average for the golf league. The
scenario is like this: We play 20 weeks. Some folks miss a week or two
so we need a current week average of our last three rounds. I can
certainly figure the last three "weeks" out, but if they're blank, I
need to go back to the last round. Using our first 7 weeks, here's
what I'm trying to accomplish:

Week 1 2 3 4 5 6 7 Overall - Last 3
Jeff 88 87 93 89 94 -- 92 90.50 91.67
Mike 90 98 93 94 -- 90 88 92.17 90.67
Tom 79 80 -- 82 -- 87 -- 82.00 83.00
Jim 85 87 79 -- 82 81 -- 82.80 80.67

I only need the formula for the "Last 3" column.

Any ideas?
Jeff...