Answer:
Now we have everything in order to replace into formula (1):
 
    
 
    
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=2.75 represent the sample standard deviation
n=10 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 0.90 or 90%, the significance is  and
 and  , and the critical vaue would be
, and the critical vaue would be  
Now we have everything in order to replace into formula (1):
 
    
 
    
 
        
             
        
        
        
15.
0.20*x = 0.01*x + 38 => 0.19*x = 38 =>( 19/100 )*x = 38 => x = 3800/19 => x = 200.
        
             
        
        
        
Answer:
C, 7 1/2
Step-by-step explanation:
You add all of the fractions together.
 
        
                    
             
        
        
        
Answer:
The volume of sphere is  .
. 
Step-by-step explanation:
We have,
Radius of a sphere is 18 units.
It is required to find the volume of sphere.
The formula of the volume of sphere in terms of radius is given by :

Plugging all values in above formula

So, the volume of sphere is  .
. 
 
        
             
        
        
        
Answer:
2x + y + 5 = 0
Step-by-step explanation:
y − 1 = -2 (x + 3)
y − 1 = -2x − 6
2x + y + 5 = 0