"joeu2004" wrote:
Suppose the first two rows of your data below are in A3:B4. To
interpolate "points" for 2:08, put 2:08 into a cell (C1 here, although
the more natural place is in a new row between A3 and A4)

No: putting in a new row between A3 and A4 would cause problems.


and write:
=trend(B3:B4,A3:A4,C1)

Disregard this. I did not see Shane's superior response in Google Groups.
In fact, I do not even see my response there yet. Google Groups is having
problems today.