GRE Problem Solving Question 699

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Source: Magoosh

Set X consists of 100 numbers. The average (arithmetic mean) of set X is 10, and the standard deviation is 4.6. Which of the following two numbers, when added to set X, will decrease the set's standard deviation by the greatest amount?

  • A (-100) and (-100)
  • B (-10) and (-10)
  • C 0 and 0
  • D 0 and 20
  • E 10 and 10

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