**Read this article to learn how to Calculate Standard Deviation in 3 different Series!**

**A. Individual Series****: **

Deviation can be taken from Actual Mean and following formula is used.

**B. Discrete-Series****: **

Here also the deviations can be taken from Actual or Assumed Mean.

From Actual Mean:

S.D.=√∑*fx ^{2}*/N

Where x^{2} is the square of deviations from actual mean, *f* denotes corresponding frequency; N = *∑* *f*

**C. Continuous Series****: **

Here we take the deviations from Actual or Assumed Mean as desired from the Mid Point of Class-Intervals.