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WEEK 9
TOPIC: DATA PRESENTATION
CONTENTS:
(i) Line graph, (ii) Bar graph (iii) Histograms (iv) Pie Chart (v) frequency polygon (vi) Deductions and Interpretations.
LINE GRAPH
Line graphs are used to show trends over a period of time and have the advantage that they can be extended. To draw a line graph, plot the given data as a series of points and then join the points together by straight lines. The lines can be drawn vertically or horizontally and have no thickness.
Example 1
A comparison of traffic densities in a number of countries produced the following results.
| Country | Number of Vehicles |
| U. S.A | 61 |
| U.K | 51 |
| West Germany (W.G) | 51 |
| Italy | 49 |
| Belgium | 36 |
| France | 26 |
| Japan | 20 |
Present the data in a line graph
Solution
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