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Using the bar graph, answer the following questions:
(a) Name the rivers longer than 5000 km.
(b) Which river is approximately 4000 km long?
(c) What is the difference between the lengths of the longest and the shortest rivers?

Solution: We draw a horizontal bar graph for the given information. For this, we proceed as follows:
Step 1: Draw two mutually perpendicular lines, one horizontal and the other vertical.
Step 2: On the vertical line, mark the names of the rivers and the lengths of the rivers
on the horizontal line.

Step 3: Choose a suitable scale. On the horizontal axis, take 1 unit length = 1000 km, and
1 unit length = 100 km.
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Step 4: Calculate the length of the bars for each river accordingly:

River Length Approximate Length Length of Bars

Nile 6,690 km 6,700 km 6,700 ÷ 1000 = 6 + 7 units
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Yangtze 5,530 km 5,500 km 5,500 ÷ 1000 = 5 + 5 units
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Murray 2,508 km 2,500 km 2,500 ÷ 1000 = 2 + 5 units
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Volga 3,700 km 3,700 km 3,700 ÷ 1000 = 3 + 7 units
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Missouri 4,090 km 4,100 km 4,100 ÷ 1000 = 4 + 1 units
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Amazon 6,300 km 6,300 km 6,300 ÷ 1000 = 6 + 3 units
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Step 5: As per the length calculated, draw bars of equal width, keeping equal gaps
between consecutive bars.

123 Data Handling and Presentation