Define Standard Deviation. Write the steps involved in finding Standard Deviation in case of Individual series
 

Dear Student, Standard deviation refers to a tool for dispersion measurement in a distribution. Technically, it refers to the square root of the arithmetic mean of the squares of deviations of observations from their mean value. And is generally denoted by sign 'sigma' i.e. σ. Standard Deviation can only be measured through mean. Formula for calculating standard deviation in the individual series is:-                Formula :-                Standard Deviation (σ)= √[∑D²/N] Here, D= Deviation of an item relative to mean,           N= The number of observations. Steps involved are:- Firstly, find the D, then do its square and then do sum of D square. Thereafter, Divide it by no. of observation. Then, Do the root of the result. Regards!