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There is no agreed definition of outliers.

However two common criteria to identify outliers are:

Method I:

If Q1 is the lower quartile and Q3 the upper quartile then any number smaller than Q1 - 1.5*(Q3 - Q1) or larger than Q3 + 1.5*(Q3 - Q1) is an outlier. By that criterion there is no outlier.

Method II:

Assume the numbers are normally distributed. then outliers are with absolute z-scores greater than 1.96. Again, there are no outliers.

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Q: What is the outlier in 64 67 68 69 73 75 79?
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