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Standard deviation is the square root of the variance of a random variable, an estimator thereof, or a similar measure of the spread of a batch of data.

2
votes
So, you want to calculate the standard deviation step-by-step. So, firstly, you should calculate the sum of the differences of all data points with the mean. Have a variable called count and set it t …
answered Sep 11 '15 by Dawny33
9
votes
Standard deviation on bar graphs can be illustrated by including error bars in them. The visualization(source) below is an example of such visualization: From a discussion in the comments below, …
answered Oct 19 '15 by Dawny33