中等math-u01-d02
A length is given as 12.4 cm correct to the nearest 0.1 cm. The maximum possible absolute error is:
A. 0.05 cm✓ 答案
B. 0.1 cm
C. 0.01 cm
D. 12.45 cm
解說
Rounding to the nearest 0.1 means the true value lies within half of that unit, so the maximum absolute error is 0.05 cm. The true length is between 12.35 and 12.45 cm.