Answer:
Im pretty sure its A. 83%
Step-by-step explanation:
 
        
             
        
        
        
Answer:
z=1.96
Step-by-step explanation:
Using normal distribution table or technology, 97.5% corresponds to z=1.959964, generally denoted z=1.96, or 1.96 standard deviations above the mean.
(above value obtained from R)
 
        
             
        
        
        
Answer:
The increase is 9.1%
Step-by-step explanation:
<u>Step 1:  Make an equation
</u>


<u>Step 2:  Divide both sides by 66
</u>


<u>Step 3:  Find the increased
</u>


9.1%
Answer:  The increase is 9.1%
 
        
             
        
        
        
Step-by-step explanation:
6а – 2а = -48
4a=-48
a=-12