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SS1 Third Term Mathematics Lesson Note – Data Presentation II

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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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