To create a range bar graph in Excel, you can follow these steps:

1. Enter your data into Excel. In your example, you have a list of tasks and their corresponding ranges.
2. Select the data you want to use for your graph.
3. Go to the Insert tab on the ribbon.
4. Click on the Bar chart type.
5. Select the Range Bar chart subtype.
6. Your range bar graph should now be created.
7. You can customize your graph by adding a title, changing the colors, and adjusting the axis labels.
8. To add labels to each bar, right-click on the chart and select "Add Data Labels."
9. You can also adjust the spacing between the bars by right-clicking on the chart and selecting "Format Data Series." From there, you can adjust the "Gap Width" to your desired spacing.

That's it! Your range bar graph should now be complete.