The answer is 23.
Good luck :)
        
             
        
        
        
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➷ Standard deviation = 
Substitute the values in:
 = 8.1975...
 = 8.1975...
This can be rounded to give an approximate answer of 8.2
The answer is option A. 
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Answer: I did the test too
 
        
             
        
        
        
180 
This is because 12x5x3 = 180