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In a histogram with UNEQUAL class widths, the quantity plotted on the vertical axis (so that AREA represents frequency) is:

Class 9Collection and Presentation of DataStatistics and Probability
  • AFrequency density (frequency divided by class width)
  • BFrequency itself
  • CClass mark
  • DCumulative frequency

Step-by-Step Solution

For unequal widths, bar height = frequency density = frequency / class width, so that area is proportional to frequency.
Answer: A) Frequency density (frequency divided by class width)

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