Question

Mr. Nakamora wants to test the accuracy of an old balance in his classroom compared to a brand-new balance that he knows is accurate. He weighs an object on the old balance and finds it to have a mass of 15.6 grams. The same object weighs 15.9 grams on the brand-new balance.

What is the percent error between the old and new balance?

0.97%
1.29%
1.89%
2.29%

Answer 1

Percent error = |measured − true| / true × 100% = |15.6 − 15.9| / 15.9 × 100% = 0.3 / 15.9 × 100% ≈ 1.89%.

Answer: 1.89%