Q:
Question about the Attribute Precision
A:
The value of base precision scales with level and always gives 4% critical chance. So yes, this is correct.
You calculated 48.5591% instead of 47% because the formula is incorrect. The formula you have obtained from the wiki was not provided by ArenaNet and is the result of one user’s trial and error data to get a rough calculation. If you have calculated a more accurate formula feel free to update the wiki article.
Community Coordinator
Thanks for your question, but this subforum is for Game Bugs so will be closed. Thanks for your understanding and cooperation!