Sort the data from smallest to largest
Find the first quartile (Q1)
Find the third quartile (Q3)
Compute the interquartile range: IQR = Q3 – Q1
Compute the lower fence: Q1 – 1.5 × IQR
Compute the upper fence: Q3 + 1.5 × IQR
Identify any values below the lower fence as outliers
Identify any values above the upper fence as outliers