What is an example of a precise measurement?

What is an example of a precise measurement?

• A. 138.50 g, 138.75 g, 139.00 g
• B. 140.50 g, 140.60 g, 140.70 g
• C. 141.02 g, 141.04 g, 141.01 g
• D. 142.50 g, 143.00 g, 142.75 g

Answer: (C)

Precision in measurement means how closely repeated measurements agree with one another. The set 141.02 g, 141.04 g, and 141.01 g stays within about 0.03 g of a central value, showing the measurements are highly consistent. The other options spread over a larger range (about 0.50 g in one case and about 0.20–0.25 g in another), so they are less precise. All options use two decimal places, but precision is about the consistency of the values, not their closeness to the true mass. So this set is the best example of precision because the numbers cluster tightly around the same value.

Precision in measurement means how closely repeated measurements agree with one another. The set 141.02 g, 141.04 g, and 141.01 g stays within about 0.03 g of a central value, showing the measurements are highly consistent. The other options spread over a larger range (about 0.50 g in one case and about 0.20–0.25 g in another), so they are less precise. All options use two decimal places, but precision is about the consistency of the values, not their closeness to the true mass. So this set is the best example of precision because the numbers cluster tightly around the same value.