Mathematics for IGCSE & O level - Limits Of Accuracy (Section 1 - No. 40)
A measurement of 128 cm is given to the nearest centimetre. Which two measurements are the boundaries of this interval?
127 cm and 129 cm
127.5 cm and 128.5 cm
128 cm and 129 cm
128.5 cm and 129.5 cm
Forklaring
The nearest centimetre means the actual measurement falls within half a cm of 128 cm. Therefore, the lower bound is 127.5 cm and the upper bound is 128.5 cm (not including 128.5 cm).