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CA Foundation · Quantitative Aptitude · Statistical Description of Data

A frequency distribution of marks has classes 0–10, 10–20, 20–30, 30–40 and 40–50. To draw a frequency polygon directly (without first drawing a histogram), the frequency of each class is plotted against which x-value?

Each class frequency is plotted against the mid-point of its class, here 5, 15, 25, 35 and 45, and the points are joined by straight lines. Class limits are used for ogives, not for frequency polygons.

  1. ALower limit of the class
  2. BUpper limit of the class
  3. CMid-point of the classCorrect
  4. DCumulative frequency of the class

Explanation

A frequency polygon is drawn by plotting each class frequency against the class mid-point and joining the points by straight lines. Using the limits is the method for ogives. Cumulative frequency is not the x-coordinate in a polygon.

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