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Calculate the average, minimum and maximum rating in each group:

1. Select the value Group in the Row labels input.
2. Leave the Column labels input empty.
3. Remove the value Group and select the value Average rating in the Calculated column input.
4. Select the value Average in the Operation type input.
5. Add the value Max in the Operation type input.
6. Add the value Min in the Operation type input.
   
7. Click the  icon and Save changes.