Final answer:
Darragh's Golden Eagle coin has lost 0.164 grams compared to the mass of an uncirculated Golden Eagle coin.
Step-by-step explanation:
To calculate how much mass Darragh's coin has lost, we subtract the current mass of the coin from the mass of an uncirculated coin. The mass of Darragh's Golden Eagle coin is 13.551 g while an uncirculated coin has a mass of 13.715 g.
The amount of mass lost is calculated as:
Mass of uncirculated coin - Mass of Darragh's coin
13.715 g - 13.551 g = 0.164 g
Therefore, Darragh's coin has lost 0.164 grams.