Standard deviation - A quantity expressing by how much the members of a group differ from the mean value of the group.
Low deviation - Numbers ranging close to the average.
High deviation - Numbers ranging far from the average.
Sample (Sample of population data set) RED
Sigma (Entirety of population data set) BLUE
∑ = 'The sum of'
n = Number of population data
n - 1 = Number of sample population
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