| Value | Category | Cases | |
|---|---|---|---|
| 1 | Right answer | 1570 | 
                                                                 
                                    
                                    35.7%
                                 
                                                             | 
                                                        
                    
| 2 | Wrong answer | 1247 | 
                                                                 
                                    
                                    28.4%
                                 
                                                             | 
                                                        
                    
| 8 | DK | 1561 | 
                                                                 
                                    
                                    35.5%
                                 
                                                             | 
                                                        
                    
| 9 | NA | 14 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             |