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For a frequency distribution mean deviation from mean is computed by:

1. $\text{M.D.}=\frac{\sum\text{f}}{\sum\text{f}\ |\text{d}|}$
   
2. $\text{M.D.}=\frac{\sum\text{d}}{\sum\text{f}}$
   
3. $\text{M.D.}=\frac{\sum\text{fd}}{\sum\text{f}}$
   
4. $\text{M.D.}=\frac{\sum\text{f}\ |\text{d}|}{\sum\text{f}}$