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A set consists of 20 different numbers whose average is 10. Which of the following pairs, when added to the set of numbers, must reduce its standard deviation?
A. 0, 0
B. 0, 20
C. 10, 10
D. -10, 10
E. 5, 15
Answer: C
Source: Veritas Prep
A. 0, 0
B. 0, 20
C. 10, 10
D. -10, 10
E. 5, 15
Answer: C
Source: Veritas Prep
