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A teacher recorded the science-fair scores (out of 100 points) of 19 students. The box plot of these scores has the five-number summary below: Minimum: 52 points Q1: 68 points Median: 74 points Q3: 82 points Maximum: 98 points Using the 1.5×IQR rule, what is the lower outlier boundary for this data set — that is, the smallest score that would NOT be classified as a low-end outlier?

  1. 47
  2. 54
  3. 61
  4. 103

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