Yes, any question that involves numbers would be a statistical question. 
        
                    
             
        
        
        
Theoretical because they haven’t tested it yet that is just their hypothesis
        
             
        
        
        
The answer is c with a side of bacon hope that helps. :)
        
                    
             
        
        
        
Answer:
∠b=82°
Step-by-step explanation:
143°=∠c+∠b (exterior angle property)
143°=61°+∠b
∠b=143-61
∠b=82°