- posted 4 years ago
I frequently deposit coins into a bank, after counting them with a mechanical counter. When each tube is full, that's the right amount for the bank's coin bag. The bank weighs the bag to check it's got enough coins in it. Sometimes they say there is one short, so I checked the machine, and found that a lot of coins have worn thinner, so it can be +/- one coin in a tube. Surely this means the weight could be +/- one coin too? Thinner coins are lighter by about the same amount that they provide less height in the coin pile in the tube.