It is very easy for you to add dynamic range to a chart. We are going to go through this, in a step-by-step format.
Click on insert (1) and then choose table (2).
Just click ok.
Note: If you click on the beginning of data, it would automatically choose all the range. If it does not, you can change it yourself. Otherwise, just follow the step.
Click on insert (1), and then click on scatter chart (2).
Add data to the table created in step 2, and the chart would be dynamically changing.