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Practice, difficulty 2 of 3

How many outliers?

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A quality engineer measured the tensile strength (MPa above specification) of 16 welded joints:

47, 45, 50, 39, 47, 53, 52, 22, 83, 53, 62, 40, 51, 43, 53, 37

Using type 7 quartiles and the 1.5 × IQR rule, how many of the 16 values are flagged as outliers?