For frequency distribution presentation, which option is wrong?

This question was previously asked in
SSC CGL Tier-II ( JSO ) 2021 Official Paper ( Held On: 10 August 2022 )
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  1. In a histogram, a bar is created above each score (or class interval) so that the height of the bar corresponds to the frequency
  2. Bar graph presents score categories that are measured from a nominal or an ordinal scale
  3. The smooth curve emphasizes the fact that the distribution is not showing the exact frequency for each category.
  4. In a polygon, an additional line is not drawn at each to bring the graph back to a zero frequency

Answer (Detailed Solution Below)

Option 4 : In a polygon, an additional line is not drawn at each to bring the graph back to a zero frequency
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Detailed Solution

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The correct answer is in a polygon, an additional line is not drawn at each to bring the graph back to a zero frequency.

Key Points

  • A frequency polygon is a line graph that plots class frequency against the class midpoint. You can get it by connecting the midpoints of the rectangles' tops in the histogram.
  • One must include the first and last class with zero frequencies in order to confirm that our graph is genuinely a polygon (i.e., the graph is closed-shape). Draw attention to the frequency column and the column with the midpoints for each class. 

Additional Information

  • A histogram is a bar graph with rectangle-shaped bars displaying the data, but a frequency polygon is a line graph with a curved line showing the data. 
  • A polygon has flat surfaces throughout. A polygon must have a minimum of three sides. Each side of a line segment must intersect another line segment only at its terminal. By counting the sides of a polygon, we may quickly ascertain its geometry. 

Hence, for frequency distribution presentation, the wrong option is in a polygon, an additional line is not drawn at each to bring the graph back to a zero frequency.

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