Recall the ordered data. 17 22 27 27 28 31 33 37 The 20th percentile will occur at a position between the first and second observations. In other words, between the first observation of 17 and the second observation of . To find the exact value of the 20th percentile, multiply the decimal portion from L20 by the difference between the first and second observations. Then, add this value to the first observation. 20th percentile = first observation + decimal portion of L20(second observation − first observation) = 17 + 0.8(-17) =

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