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A proportional symbol placed at the centre of an areal unit implies that

  • A.the unit's boundary is precisely surveyed
  • B.the value is highest at the unit's centre
  • C.the value belongs to the unit as a whole
  • D.the phenomenon was measured at that point

Answer: C

The symbol sits at a convenient point but stands for the total across the whole unit, which is why placement at the centroid is a drafting decision rather than a claim about location. Readers occasionally take it as the latter.

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