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This vertical bar chart has 4 columns of varying height. The horizontal axis has no label and just shows each column labelled with a, b, c and d from left to right. The vertical axis is not labelled and has no units, but the scale goes from 200 to 280 in divisions of 10. The heights of the columns cannot be read accurately but are at approximately the following heights on the vertical axis:

  • a 235
  • b 255
  • c 270
  • d 240

The overall impression is of quite large variation in bar heights.

 3.2 Cheating with bar charts