Video: Calculating the Range of the Data in a Dot Plot

What is the difference between the highest score and the lowest score?

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Video Transcript

What is the difference between the highest and lowest scores in the dot plot shown below?

This graph shows the distribution of all the scores of people who took this test. And we wanna know the difference between the highest and the lowest scores. But before we can calculate the difference, we’ll first need to identify the highest score and the lowest score.

Let’s start with our highest score. We have a range from 88 to 100. There are no xs above the 100, which means no one scored 100 on this test. But two people received a score of 99. This makes 99 the highest score.

We can follow the same procedure to find the lowest score. No students scored 88, and four students received a score of 89. A score of 89 is the lowest score on our graph, and the difference is the distance between these two points.

From 89 to 99 is a range of 10. 89 plus 10 equals 99. 99 minus 89 equals 10. The difference between the highest score and the lowest score in this graph is 10.

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