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In a double bar graph comparing two quantities, what is essential?

Class 9Bar Graphs and HistogramsStatistics and Probability
  • AA legend/key identifying the two bar colours
  • BOnly one colour of bars
  • CNo axis labels
  • DPie slices

Step-by-Step Solution

A double bar graph needs a legend so the reader can tell which colour stands for which data set.
Answer: A) A legend/key identifying the two bar colours

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