| Value | Category | Cases | |
|---|---|---|---|
| 1 | Right answer | 1373 | 
                                                                 
                                    
                                    31.3%
                                 
                                                             | 
                                                        
                    
| 2 | Wrong answer | 1200 | 
                                                                 
                                    
                                    27.3%
                                 
                                                             | 
                                                        
                    
| 8 | DK | 1785 | 
                                                                 
                                    
                                    40.6%
                                 
                                                             | 
                                                        
                    
| 9 | NA | 34 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             |