28 books. 59(current books) - 31(past books) equals the amount of books Sandy bought, which is 28 books. Hope it helped
        
             
        
        
        
Nonparametric tests are also called distribution-free tests because they don't assume that your data follow a specific distribution. You may have heard that you should use nonparametric tests when your data don't meet the assumptions of the parametric test, especially the assumption about normally distributed data.
        
             
        
        
        
Answer:
Y = 2
E = 9
A = 1
R = 0
Step-by-step explanation:
2222 - 999 + 11 - 0 =1234
 
        
             
        
        
        
3,-4 is the correct anwser