Answer:
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<h3>Given equations</h3>
- v + 8w = 4v and - m + 5n = - 2
<h3>Solve the first equation for v</h3>
- v + 8w = 4v
- 4v - v = 8w
- 3v = 8w
- v = 8w/3
<h3>Solve the second equation for n</h3>
- - m + 5n = - 2
- 5n = m - 2
- n = (m - 2)/5
 
        
                    
             
        
        
        
Solution: We are given below data:

Now to find the mean deviation, we use the below formula:

Where:
 represents the summation
  represents the summation
X, represents the observation.
 represents the mean
 represents the mean
N represents the number of observation.


Therefore, the mean deviation is:

         = 4
 
        
                    
             
        
        
        
Answer:
B 
Step-by-step explanation:
 
        
             
        
        
        
2 - b.
3 - a.
I'm not sure about 4. Hope this helps!