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It is a statistical measure that helps you understand the sample/population data.
It is a very easily calculated measure of the spread of data.
They are a simple measure of the spread of the data, which is not affected by extreme values.
You can use the mean to answer some statistical questions: it is a measure of the central tendency of a set of data. However, it is no good in identifying the maximum value of a set of data, for example.
Standard deviation is a measure of the spread of data.