GrandFather has offered a Perl-ish answer to your actual question.

This node is non-Perl and non-statistical. Rather, it questions your approach as outlined in your comment 'I am simply checking to see if the recv'd amount is within 95% of the prediction. So for this example, this feed would be marked as "completed."'

I hope I'm wrong, but that sounds a lot like tossing lighted flares into a powder keg.

But maybe not.

• What's the significance of marking a feed as "completed"?
• Does that cause any action other than removing it from your (figurative) todo list?
• If so, do you dare risk an action based on a possibly misbegotten belief that a feed has been completed?
• If you're going to wait for a feed to be 80 or 95% complete, why are you trying (or so I gather) to avoid waiting a small, further increment, for actual completion? After all, actual completion can be tested -- fairly rigorously -- in various reliable ways.