Mathematics for IGCSE & O level - Limits Of Accuracy (Section 2 - No. 5)
Por won the 200m race in a time of 24.2 seconds to the nearest tenth of a second. Which is the correct range of Por's time?
24.1 seconds and 24.3 seconds
24.15 seconds and 24.25 seconds
24.2 seconds
24.25 seconds and 24.35 seconds
Explanation
Since the time is to the nearest tenth of a second, we can determine the lower and upper bounds as 24.2 - 0.05 and 24.2 + 0.05. The time therefore lies between 24.15 seconds and 24.25 seconds.
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