why would you write 13.90 when only two sig figs were given? Where does the extra "precision" come from?

Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
Publisher:Skoog
Chapter6: Random Errors In Chemical Analysis
Section: Chapter Questions
Problem 6.1QAP
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why would you write 13.90 when only two sig figs were given? Where does the extra "precision" come from?
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