Final answer:
To accurately convert an answer to kilograms using the correct significant figures, round the final result to match the least precise measurement's decimal places, here exemplified by rounding to 15.2 kg when the least precise measurement is 13.7 kg.
Step-by-step explanation:
To convert an answer to kilograms and ensure it is accurate using the correct number of significant figures, it is essential to assess the precision of the measurements provided in the question. For instance, if the least precise measurement given is 13.7 kg, which is accurate to the 0.1 decimal place, then the final answer must also be expressed to the 0.1 decimal place. This maintains the integrity of the measurement's precision.
For example, if the calculation outcome is 15.24 kg, we would round this to 15.2 kg to match the least precise measurement's decimal places. This rounding process ensures that our final answer in kilograms reflects the appropriate level of precision dictated by the measurements involved in the calculation.
When adding or multiplying different measurements, the result must match the least number of significant figures or least precise decimal place of the measurements used. This standard is observed across various applications, including weights and capacities like kg and L, as well as measurements of length such as meters (m) or square meters (m²).