中等MATH-NUMB-003
A length is measured as 12.5 cm, correct to the nearest 0.1 cm. What is the maximum absolute error?
A. 1 cm
B. 0.5 cm
C. 0.1 cm
D. 0.05 cm✓ 答案
解說
When a measurement is rounded to the nearest 0.1 cm, the maximum absolute error is half of that unit, 0.05 cm. Using the whole unit, 0.1 cm, is the usual mistake.