Mathematics for IGCSE & O level - Limits Of Accuracy (Section 1 - No. 18)
A piece of paper is measured to be 21.0 cm and 29.7 cm, both to the nearest millimetre. What is the lower bound of the perimeter?
101.2 cm
101.1 cm
101 cm
100.9 cm
คำอธิบาย
Lower bound perimeter = 2 * (20.95 + 29.65) = 101.2, to 3 sig fig, the answer is 100.9