Practical Name:
The Percentage of Literate males between the ages of 15 to
45 in a colony is given in the table below.
Class 15-20 20-25 25-30 30-35 35-40 40-45
Percentage 42 38 35 26 16 5
Draw a Histogram and Frequency Polygon.
Tools/Software: Computer with Geogebra Software installed
Procedure:
1. Open Geogebra. From the ‘Options’ Menu click ‘Advanced.’
See Figure 1 below. Select ‘Preferences -- Graphic’.
2. Click on x-axis Tab and click on Label. Enter 'Age' as
label.
3. Click on Y-axis Tab and click on Label. Enter
‘Percentage’ as label.
4. Click on Grid tab. Select show Grid. Enter grid distance
as ‘2.5’ for x-Axis.
5. In the Input Box at the bottom of the Screen type,
histogram[{15,20,25,30,35,40,45}, {42,38,35,26,16,5}] and press Enter. The
required Histogram will be displayed. Use the Mouse Scroll button and the Move
Graphics View Tool from Tool 11 to position the graphics area properly.
6. Click on Tool 2 and Select ‘Segment between two points’.
7. Click on x-Axis at 12.5 and then on each class mark on
the top of the histogram. Click on 47.5 on the x-Axis to complete the Frequency
Polygon. The required Frequency Polygon will be obtained. In the Algebra
section under Points, click on the green buttons indicating the points. This
will remove the labeling of the points from the Frequency Polygon.
Result: A histogram
and frequency polygon is drawn as shown in the figure.
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