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A choropleth of unemployment uses classes 0 to 4, 4 to 8, 8 to 12 and over 12 per cent. A district with 900 unemployed out of a workforce of 9,000 falls into which class?

  • A.the second
  • B.the fourth
  • C.the first
  • D.the third

Answer: D

Nine hundred out of nine thousand is 10 per cent, which lies in the 8 to 12 band, the third class. Converting the count to the mapped rate before consulting the legend is the step most often skipped, and reading the raw count against the classes would put the district in the wrong band.

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