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Statistics II

__Drawing Pie Diagram :__
- Find measure of central angle using formula (x / Total f
_{i}).360^{0}.
- Draw central angles on circle of convenient radius.

__Drawing Histogram :__
- 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.

__Drawing Frequency Polygon or Frequency Curve :__
- 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.