Mathematics for IGCSE & O level - Limits Of Accuracy (Section 2 - No. 18)
A town has a population of 108,000 to the nearest 1000. Its area is given as 129 km² to the nearest km². Calculate the upper bound of its population density, giving your answer to 3 significant figures.
837 / km²
840 / km²
845 / km²
850 / km²
Explanation
Upper bound of population density = (Upper bound population) / (Lower bound area) = 108500 / 128.5 = 844.35. To 3 significant figures this is 844 / km²
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