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The largest of 9 observations is increased by 18. Which statement is true?

Competition practiceStatistics
  • AMean and median both rise by 2
  • BMean rises by 18; median unchanged
  • CMean rises by 2; median unchanged
  • DMedian rises by 2; mean unchanged

Step-by-Step Solution

The sum rises by 18, so the mean rises by . The middle (5th) value is untouched, so the median stays the same.
Answer: C) Mean rises by 2; median unchanged

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