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A set consists of 10 positive integers. What is the standard deviation of the set?

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by Vincen » Sat Dec 26, 2020 2:32 pm

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A

B

C

D

E

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Difficulty—

A set consists of 10 positive integers. What is the standard deviation of the set?

(1) The sum of all integers of the set is 10 times the value of any integer of the set
(2) If all of the integers of the set are either multiplied or divided by 10, the standard deviation of the set does not change

Answer: D

Source: e-GMAT
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