Well you do know that Pi never ends, but the convention is to end it rounded off to either 3.16 or 3.1596. The conventional wisdom for Rivals using their numerical ratings is to round it off to three decimals so I do.
If I had wanted to be really precise I would have used 5.660000000000000000000000000000000000 and 5.61633333333333333333333333333333333333333333333333333333333333, you can expand on those if you like, you can probably figure it out.
Now if you have trouble with numbers then you might want to keep using the simpler but MUCH less accurate star rating, for that for instance a 3 star is a 3.0000000000000000000000000000000000000000000000.
But if you do want to be more accurate when you average a number of recruits then you will have to use some decimals. even in the simpler star system, alas. Good luck.