They're plotting the points, coming up with a line of best fit, then making some predictions (like what will the record time be in 2015 and when will it be 9 seconds?). Then I'm asking them to do the same process on their calculator and do the linear regression.
It always makes for an interesting conversation!
The question also came up in class as to how long it would take him to run a marathon. After some fun conversions, here's what we came up with:
67.3 minutes. We know it's not possible, but wow. (The world record is 2:03.38)
Here's the document I gave the kids: