Frequency Distributions and Graphs

• Rules for Constructing a Frequency Polygon

  • The point is placed over the mid-point of the class interval.
    • Mid-point=UL-LL/2
  • We assume that the interval above & below the highest and lowest class intervals are zero.
  • To smooth a frequency polygon use:
    • FS=X1+X2+X2+X3/4
  • Start the Lowest class interval on the left side of the graph

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