Statistics - Standard Deviation


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Standard deviation is the square root of the average of squared deviations of the items from their mean. Symbolically it is represented by ${\sigma}$.

We're going to discuss methods to compute the Standard deviation for three types of series:

Individual Data Series

When data is given on individual basis. Following is an example of individual series:

Items510203040506070

Discrete Data Series

When data is given alongwith their frequencies. Following is an example of discrete series:

Items510203040506070
Frequency251312057

Continuous Data Series

When data is given based on ranges alongwith their frequencies. Following is an example of continous series:

Items0-55-1010-2020-3030-40
Frequency251312


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