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