FWIW, my guess was at the 98th percentile, relatively close to the data (on the other hand, I was really bad at guessing the position of the ball in yesterday's football/soccer test).

The median guess probably suffers from a "connect the dots" bias, going from (0,0) to (100,100) through the suggested point.

Seeing how smooth the data is, it results from a large sample, and the measurements are objective, I fail to see how they could have gotten them wrong.