Final answer:
The skateboard ramp measurements of 27.4 cm, 27.5 cm, and 27.5 cm are precise since they're close to each other but not accurate as they are far from the actual height of 30.5 cm. Thus, the results are best described as precise but not accurate.
Step-by-step explanation:
When evaluating measurements for their quality, we commonly refer to their accuracy and precision. Accuracy refers to how close a measurement is to the correct or accepted value. In contrast, precision refers to the reproducibility of measurements. In the provided scenario, where three different measurements of a skateboard ramp's height are 27.4 cm, 27.5 cm, and 27.5 cm, while the actual height is 30.5 cm, the measurements are precise but not accurate. They are reproducible as they are very close to each other (27.4 cm and 27.5 cm), but they are far from the true value of 30.5 cm. Therefore, the best description of these results is option B) Precise but not accurate.