mathematical extrapolation in a sentence

1. Mathematical extrapolations are ultimately based on the data available, but that data itself may be fragmentary and not the " complete picture ".
2. While mathematical extrapolations and " heroic " computer work by BEA statisticians have enabled the agency to fill in the gaps, he said, BEA officials " are becoming more concerned " about the accuracy of their data.
3. It's difficult to find mathematical extrapolation in a sentence.