How to find standard deviation

Let us learn how to find standard deviation.The variance is the measure of variability about the mean. To find standard deviation is the square root of average squared deviation from the mean.In the determination of variance, we find that the units of individual observations xi and the unit of their mean or [barx] are different from that of variance, since variance involves the sum of squares of (xi– [barx] ). The mean of a set of examination is expressed as positive (+ve) square-root of the variance and is called standard deviation. In order to find standard deviation the following formula is to be used.The formula for standard deviation is
σ = [sqrt((1/n)sum_(i=1)^n (x i - barx )^2)] . In find standard deviation usually denoted by σ.Hope you like the above example of how to find standard deviation.Please leave your comments, if you have any doubts.