The outlier of the data set given, using the IQR, is: 0.
IQR = Q3 - Q1.
Given, 23, 80, 43, 23, 0, 20, 23, 23, 20, 28:
Q1 = 20
Q3 = 31.75
IQR = 31.75 - 20
IQR = 11.75
Outliers for the data set are data points below:
Q1 - 1.5 × IQR = 20 - 1.5 × 11.75 = 2.375
The only data point below 2.375 is: 0.
The outlier is therefore: 0.
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