Just one last one on coin precision. I finally got someone who's been collecting state quarters to lend me 35 Utah quarters. These all have the Philadelphia mint P symbol (there were some D's, but not enough for a significant sample size so I excluded them) and all are 2007. None appears worn significantly. The results were:
Mean Weight: 87.68 grains
Standard Deviation: 0.45 grains
Extreme Spread: 1.96 grains (Highest: 88.70 grains: Lowest: 86.74 grains)
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