40/50 is equal to 80 percent, a calculator can provide this result
        
                    
             
        
        
        
Answer:
h. 36
Step-by-step explanation:
For a 68.26% confidence, z = 1.0.
Standard deviation (s) = 30 minutes
The sample size needed to assure that the sample mean does not differ from the true mean by more than 5 minutes is given by:
 
The sample size needed is 36.
 
        
             
        
        
        
The answer for this problem is b
        
             
        
        
        
the 3rd one. hope this helps
 
        
                    
             
        
        
        
Answer:900000
Step-by-step explanation:
Use a calculator