Answer:
3 standard deviations away
Step-by-step explanation:
Three (3) standard deviations away from the mean of the data is common practice of consideration of an outlier. 3 is considered the default value and threshold for most data distributions similar to Gaussian like distributions.
Standard deviations are very sensitive to outliers and a unit alteration or change can cause substantial effect on the standard deviation. Some data distribution have similar mean, but standard deviations can alter with the spread.
