The most common measures of dispersion for metric variables are the standard deviation and the variance in statistics. These two measures relate each expression of a variable to the mean and indicate how much the individual expressions scatter around the mean.

What is the standard deviation and how do I calculate it?
In statistics, the standard deviation gives you the spread of a variable around its mean. The standard deviation, is the average distance of all measured values of a variable from the mean of the distribution.
The measure of dispersion standard deviation thus indicates how much the individual values scatter around the mean value. If the individual values scatter strongly around the mean, the result is a large standard deviation of the variable.

Sorry, in the example of course a standard deviation of 11.50 comes out and not 12.06!!!!

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0:00 Introduction
0:22 What is the standard deviation?
2:16 How do I calculate the standard deviation?
4:09 Why are there two formulas?
5:59 What is the difference with variance?
7:17 Calculate the standard deviation online.