I enter data on a daily basis. There is one column on a particular
worksheet in which I need a running average -- that is, average the
column, and when I enter new data, instantly update the average, so my
average is always up-to-date -- automatically.

I'd love to know how to set this up.

A second question:
How can I apply this formula or function of a continuous update
average to a portion of a column, instead of the whole column? I can
identify the starting cell, but the ending cell will change every time
I enter data.

Thank you very much.