The fact that the sample of water boils at 101.5 °C instead of the normal boiling point of pure water at 100 °C indicates that there might be impurities present in the sample. When impurities are mixed with a substance like water, it can raise the boiling point of the solution. In this case, the impurities in the water caused it to boil at a higher temperature than expected.
Therefore, based on the information provided, we can infer that the sample of water is not pure and contains impurities. These impurities could be minerals, gases, or other substances that raise the boiling point of the water above 100 °C.