21. Outline the steps that one can use to change the chart type of a graph in a worksheet:
1. Open the worksheet that contains the graph you want to change.
2. Select the graph by clicking on it.
3. Go to the "Chart Design" or "Chart Tools" tab in the Ribbon menu (this tab will appear once the graph is selected).
4. Look for the "Change Chart Type" button, usually located in the "Type" or "Design" group.
5. Click on the "Change Chart Type" button to open the chart type dialog box.
6. In the dialog box, choose the desired chart type from the available options.
7. Preview the changes by looking at the chart preview or thumbnail provided in the dialog box.
8. If necessary, customize the chart type settings by modifying any available options, such as data series, axes, labels, etc.
9. Click "OK" or "Apply" to apply the selected chart type and close the dialog box.
10. The graph will now be updated with the new chart type you selected. Review and verify the changes made.