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7-113.

Each of these number lines shows a segment in bold. Find the midpoint of the segment in bold. (Note that the diagrams are not to scale.)  

  1. A number line is given. The graph starts with a closed circle on 3 and is continuous until 9 where it is marked as a closed circle.

  2. A number line is given. The graph starts with an closed circle on negative 1 and is continuous until 7 where it is marked as a closed circle.

  3. A number line is given. The graph starts with a closed circle on negative 15 and is continuous until 2 where it is marked as a closed circle.

The midpoint is the mean, or average. What is the mean of each of these pairs of numbers?

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