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A frequency polygon meets the -axis at both ends only when:

Class 9Frequency PolygonsStatistics and Probability
  • AImaginary classes of zero frequency are added at both ends
  • BThe frequencies are all equal
  • CThe class size is 1
  • DThe data is continuous

Step-by-Step Solution

Adding a zero-frequency class before the first and after the last brings the polygon down to the -axis at both ends.
Answer: A) Imaginary classes of zero frequency are added at both ends

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