NFL Rules Question

Hey Football Expert guys help me understand something..

If a RB gains 4.7 Yards (measured exactly) on 1st and 10, is he credited with a 5 YD Run (or 4.7 or 4.0?) for his own Personal NFL stats?

If a RB gains 9.7 Yards (measured exactly) on 1st and 10, is he credited with a 10 YD Run (or 9.7 or 9?) for his own Personal NFL stats despite the fact he didn't get a First Down?

Thanks

None of the above...You can run for 4.1 yards and get a 5 yard run, or run for 4.9 and get 4 yards, depending on the spot.

They determine the Yard Line based on where the football is.  The RB always gets credited with a whole number of yards, and it is the difference between the yard lines at the start and end of the run. If the football is touching a yard line, then that yard line is used.  Otherwise it is the next line.  There are a couple minor exceptions. You can read about here, page 6 and 7.  

http://www.nflgsis.com/gsis/documentation/stadiumguides/guide_for_statisticians.pdf

Thanks for the answer (and the NFL STATS LINK)!