Drawing Pie Diagram :
Drawing Histogram :
Drawing Frequency Polygon or Frequency Curve :
- Find measure of central angle using formula (x / Total fi).3600.
- Draw central angles on circle of convenient radius.
- Make class intervals continuous.
- Take extended class intervals on X-axis.
- Take frequencies on Y-axis.
- Draw rectangles on X-axis with base as extended class intervals.
- Prepare frequency distribution table.
- Draw X-axis, Y-axis, choose proper scale.
- Take class marks on X-axis.
- Take frequencies on Y-axis.
- Plot the points.
- Plot 2 additional points, one preceding the first class and another succeeding the last class, both with frequency 0.
- In case of Frequency Polygon, join all successive points by straight lines.
- In case of Frequency Curve, join all successive points by smooth freehand curve.