Given:
Population proportion, 

 = 57% = 0.57
Population standard deviation, σ  = 3.5% = 0.035
Sample size, n = 40
Confidence level = 95%
The standard error is

The confidence interval is 

where

 = sample proportion
z* = 1.96 at the 95% confidence lvvel
The sample proportion lies in the interval
(0.57-1.96*0.0783, 0.57+1.96*0.0783) = (0.4165, 0.7235)
Answer: Between 0.417 and 72.4), or between (41% and 72%)
 
        
        
        
X=5 if that's what you were asking for
        
             
        
        
        
Answer:
576 cubic feet of dirt
Step-by-step explanation:
l x w x h
8 x 12 x 6 = 576
 
        
             
        
        
        
14 = 31.7 - 3x
-17.7 = -3x
x = 5.9
        
                    
             
        
        
        
Answer:
55°
Step-by-step explanation:
