Question

two lab groups measure the mass of a wooden block to be 15.50 grams. the actual mass of the block is 20.10 grams. the groups are accurate, but not precise. the groups are precise, but not accurate. the groups are neither accurate nor precise. the groups are both accurate and precise.

Explanation:

Accuracy refers to how close a measurement is to the true or actual value. Precision refers to how close repeated measurements are to each other. The measured value (15.50 grams) is far from the actual value (20.10 grams), so it is not accurate. Since no information about repeated - measurements is given, we assume the single - measurement case. A single measurement that is far from the actual value is neither accurate nor precise.

Answer:

The groups are NEITHER accurate nor precise.