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Which of the following pairs of numbers, when added to the set above, will increase the standard deviation of the set?

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Which of the following pairs of numbers, when added to the set above, will increase the standard deviation of the set?

by VJesus12 » Tue Sep 15, 2020 2:20 am

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\(\{9,12,15,18,21\}\)

Which of the following pairs of numbers, when added to the set above, will increase the standard deviation of the set?

I. 14, 16
II. 9, 21
III. 15, 100

(A) II only
(B) III only
(C) I and II
(D) II and III
(E) I, II, and III

Answer: D

Source: Manhattan GMAT
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