Answer:
Step-by-step explanation:
The mean (average) of a data set is found by adding all numbers in the data set and then dividing by the number of values in the set. The median is the middle value when a data set is ordered from least to greatest.
Hope this help
 
        
             
        
        
        
Step-by-step explanation:
6 times 9 is 54.
54 divided by 2 is 27 volume ( recipitor) is 27 for no.1
6 times 7 is 42 
42 divided by 2 is 21 is the recipitor or volume for no.2 
there fore a has a bigger base surface 
as base is measured by recipitorial angles 
sorry if this isnt the right answer or what u wanted but I know it this way 
 
        
                    
             
        
        
        
20
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Answer:
<h3> 78%</h3>
Step-by-step explanation:
Given
Number of scientist that line in Antarctica during the winter = 1,100
Amount of scientist  in the summer = 5,000
Increment = 5000 - 1100
Increment  = 3900
percentage change = Increment/Original amount * 100
Percentage change = 3900/5000 * 100
Percentage change = 3900/50
Percentage change = 78%
<em>Hence the percent change in the number of scientists living in Antarctica is 78%</em>
 
        
             
        
        
        
The answers are below: 
{X = 6, Y = -3}
Note: The first image is how to solve for Y. The second image is how to solve for X.