The standard deviation is the value most used. Others are variance, interquartile range, or range.
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It is a very easily calculated measure of the spread of data.
It is a measure of the spread of a set of observations. It is easy to calculate and is not distorted by extreme values (or mistakes). On the other hand it does not use all of the information contained in the data set.
They are a simple measure of the spread of the data, which is not affected by extreme values.
Standard deviation is a measure of the spread of data.
It is a simple but crude measure of the spread of data.