Frequency Polygon

Definition & Construction

Frequency Polygon

Definition

A line graph which joins the mid-point of the class interval containing in X-axis and the corresponding frequencies containing in Y-axis is called frequency polygon. In frequency polygon, the line is connected with the help of scale.

Steps of constructing frequency polygon

(a)

Draw X- and Y- axis in the graph paper.

(b)

Put the mid-value of class interval in X-axis and corresponding frequency in Y-axis with a suitable measurement.

(c)

Draw the mid-value and the corresponding frequency in the graph and join them respectively.

(d)

Take a lowest class-interval in left side and a highest class-interval in right side with the same scale. And then, take the mid-value of these extreme class-intervals and join them. Then, we can get the required frequency polygon.

Practice

Draw Frequency Polygon

📋 Given Data

✏️ Solution Table

Weight	Mid-value	Frequency	Points (Mid-value, Frequency)

🔢 KEYPAD

👆 Auto-advances: Mid → Freq → Points

Frequency Polygon

Click on the graph to plot your points.