Which is the outlier rule for the upper boundary?Q1 + 1.5 ∙ IQRQ3 + 1.5 ∙ IQRQ1 − 1.5 ∙ IQRQ3 − 1.5 ∙ IQR

The upper outlier boundary is found by adding 1.5 times the interquartile range to the third quartile: Q3 + 1.5 × IQR. Values above this boundary are considered outliers. Therefore, the correct choice is “Q3 + 1.5 ∙ IQR.”

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