Question 4 • Concepts in Probability and Statistics A
Sort set A: 15, 18, 19, 21, 26, 51. Its lower quartile is 18 and upper quartile is 26, so the interquartile range is 8. The upper outlier fence is 26 + 1.5(8) = 38, and 51 is above that fence; the other values are not outliers. Therefore, the set with one outlier is A, 15, 19, 26, 51, 18, 21.
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