Measures of Central Tendency


   
 
Summary
The Arithmetic mean is obtained by dividing the sum of all the items in the list by the total number of items.
 
Direct method
 
M =
 
Where x is mid-interval

f is frequency

M is mean

 
Short cut method
 
 
where
 
A = assumed mean

d = x - A

 
Step deviation method
 
 
Where
 
i = class size
 
 
  
     
   
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