Here dude. Here is someone other than myself explaining how you are creating bias and error by "rounding"
http://scienceblogs.com/goodmath/2009/03/01/rounding-and-bias/
http://www.statisticshowto.com/significant-digits-rounding-statistics/
Short answer: 7 is 7 until it is 8.
http://scienceblogs.com/goodmath/2009/03/01/rounding-and-bias/
http://www.statisticshowto.com/significant-digits-rounding-statistics/
Short answer: 7 is 7 until it is 8.