Class 9 Maths Statistics Frequency polygon without drawing histogram

Frequency polygon without drawing histogram:

Frequency polygons can also be drawn independently without drawing histograms. For this, we require the mid-points of the class-intervals used in the data. These mid-points of the class-intervals are called class-marks. To find the class-mark of a class interval, we find the sum of the upper limit and lower limit of a class and divide it by 2. Thus, Class-mark = (Upper limit + Lower limit)/2

 

 

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