# Formula to find standard deviation if only mean deviation is given in question

Vikas TU
14149 Points
5 years ago
It is very difficult to calculate the standard deviation directly and easily therfore the exact dats is necessary to go wwith the further calcukations.
Formulae:
sigma = root(\sum(xi – x’)^2) for i= 1 to i =N.
where x’ is the average mean.