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To close (complete) a frequency polygon when not drawn over a histogram, we add an extra class with frequency:

Class 9Frequency PolygonsStatistics and Probability
  • AZero, at each end
  • BEqual to the highest frequency
  • CEqual to the mean
  • DEqual to the total of all frequencies

Step-by-Step Solution

Imaginary classes with zero frequency are taken before the first and after the last class, so the polygon meets the -axis at both ends.
Answer: A) Zero, at each end

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