Answer:
I got 5.65
Step-by-step explanation:
36/8= 4.5,  4.5 +1.25= 5.65
 
        
             
        
        
        
Let X be the weekly incomes of a large group of executives. The weekly incomes of a large group of executives follows Normal distribution with mean $2000 and standard deviation $100. 
μ =2000, σ =100
We have to find z score for income $2100 i.e x=2100
Z = 
 = 
Z = 100/100
Z = 1
The z score for income $2100 is 1