x - 4
4 less than x means that we subtract 4 from x.
 
        
             
        
        
        
Answer:
22.5 batches 
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
z(lower) = (15-15)/4 = 0
z(upper) = (19-15)/4= 1
z  at  0 = .5
z at  1 = 0.841344746
(look these up in a Z table) 
probability "between" = 0.841344746 - .5 = 0.3841344746
 
        
             
        
        
        
32, i believe is the answer
        
             
        
        
        
Answer:9.75
Step-by-step explanation: