<span>standard deviation and variance</span>
        
                    
             
        
        
        
Answer:
 
    
 
    
And the 96% confidence is given by (110.06; 117.34)
Step-by-step explanation:
Information given
 represent the sample mean
 represent the sample mean 
 population mean (variable of interest)
 population mean (variable of interest)
s=9.1 represent the sample standard deviation
n=29 represent the sample size  
Confidence interval
The confidence interval for the mean is given by the following formula:
 (1)
   (1)
The degrees of freedom are given by:
 
The Confidence is 0.96 or 96%, the significance is  and
 and  , and the critical value would be
, and the critical value would be  
Replacing the info we got:
 
    
 
    
And the 96% confidence is given by (110.06; 117.34)
 
        
             
        
        
        
Answer:
$2
Step-by-step explanation:



Therefore, each raffle ticket cost $2.
 
        
                    
             
        
        
        
Knowing what the variables are means that all we have to do is substitute:
[ ( 3 ) ^2 + ( 4 ) ^2 ] / 4 - 3 =
( 9 + 16 ) / 1 =
25