Standard Deviation

This is the sample standard deviation of the values shown on the graph. The standard deviation is a measure of the spread of the data (the way in which they differ from the mean). It can be thought of as the “expected” difference between a randomly selected sample and the mean. It does not convey any meaningful information if the data is highly skewed.

The sample standard deviation is defined as:

Here, is the number of samples, is the value of the ith sample and is the sample mean.