Final answer:
A golden penny weighing 2.6 grams is slightly heavier than a regular penny, which suggests it has a denser composition.
Step-by-step explanation:
When comparing the mass of a "golden penny" to that of a regular penny, and considering that a regular penny weighs about 2.5 grams, a golden penny weighing 2.6 grams would be slightly heavier. This suggests that when both pennies are of the same size, the golden penny's composition is denser than that of the regular penny (possibly due to it being made of a different material or having additional mass from a plating material). This is supported by the principle that gold is more dense than materials typically used to make pennies, such as zinc or copper. Additionally, every measurement has an uncertainty which can range based on the sensitivity of the balance used, but if we trust the accuracy of the measurement provided, we can draw a conclusion about the mass.