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Presentation of Data — Economics STD 11 Commerce — Question

CBSE BoardEnglish MediumSTD 11 CommerceEconomicsPresentation of Data4 Marks
Question
Describe the procedure of drawing a histogram when class intervals are:
  1. Equal.
  2. Unequal.
✓

Answer

  1. Steps of drawing a histogram in case of equal Class Intervals:
  1. We take the class intervals on the x-axis.
  2. The frequencies are taken on the y-axis.
  3. We construct rectangles on all class intervals such that the area of each rectangle is proportional to the frequency in the corresponding class.
  1. Steps of drawing a histogram in case of unequal Class Intervals:
  1. Take the class on the x-axis.
  2. Adjust the given frequencies according to the size of the class interval. Adjusted frequencies are obtained by using the formula:
Adjusted Frequency $=\frac{\text{Lowest class size}}{\text{Size of the class}}\times\text{given frequency}$
  1. Take the adjusted frequency on the y-axis.
  2. Construct rectangles on all class intervals.
The only difference between the two procedures is that in case of equal class intervals, histogram is made on the basis of the frequencies given originally whereas, in case of unequal class intervals, histogram is made on the basis of adjusted frequencies.

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