Video: Label the Axis of a Bar Graph Correctly Using the Correct Units

The number of smart meters installed in five different states is shown in the bar graph. Given that the total number of smart meters installed in the five states is 7900000, what is an appropriate label for the vertical axis of the graph?

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Video Transcript

The number of smart meters installed in five different states is shown in the bar graph. Given that the total number of smart meters installed in the five states is 7900000, what is an appropriate label for the vertical axis of the graph?

Let’s firstly consider the five states and the numbers represented on the 𝑦-axis. State A is approximately halfway between zero and one. Therefore, the number represented by state A is 0.5. State B corresponds to one on the 𝑦-axis. The bar for state C is halfway between one and two. Therefore, C equals 1.5. State D is slightly above two. We can approximate this to 2.2. State E is above halfway between two and three but below three. We can approximate this to 2.7.

0.5 plus one plus 1.5 is equal to three. 2.2 plus 2.7 is equal to 4.9. Adding three and 4.9 gives us 7.9. This means that the total represented on the bar graph is 7.9. We know from the question that the actual number of smart meters were 7900000. This is the same as 7.9 million, as 7900000 divided by one million is 7.9. We can therefore conclude that an appropriate label for the vertical axis of the graph is the number of installations in millions. The numbers one, two, three, four, and five on the 𝑦-axis represent the number of millions of smart meters installed.

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