GMAT Problem of the Week. Issue#19

Which of the following sets has/have the same standard deviation as the set {r, s, t}?

I.      {r 1, s 1, t  1}

II.    { | r |, | s |, | t | }

III.     { r, s, r s – t }

(A)     I only

(B)     II only

(C)     III only

(D)     I and II only

(E)     I and III only

3 thoughts on “GMAT Problem of the Week. Issue#19

  1. The answer is A.
    I – If the same constant a is added to each number of the set the deviation of the new set will remain the same.

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