3. An article in the Journal of Structural Engineering describes an experiment to test the yield strength of circular tubes with caps welded to the ends. The first yields (in kN) are given below. 96 96 102 102 102 104 104 108 126 126 128 128 140 156 160 160 164 170 Calculate the sample mean, median, upper quartile, lower quartile, and sample variance.

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