GRE- Quantitative Reasoning
A. The quantity in Column A is greater;
B. The quantity in Column B is greater;
C. The quantities are equal;
D. The relationship cannot be determined from the information given.

Answer(s): D
Explanation: Standard deviation measures the dispersion of numbers around the mean (simple
average) of those numbers. The greater the dispersion, the greater the standard deviation. In
both sets, the range is 3. If x = the dispersions are the same (Quantity A = Quantity B)
because the means would be the same. Otherwise, the dispersions--and the two quantities--
differ from each other.

QUESTION: 27

A. The quantity in Column A is greater;
B. The quantity in Column B is greater;
C. The quantities are equal;
D. The relationship cannot be determined from the information given.
Answer(s): C
Explanation: Manipulate the expression in Column A so that it resembles the expression in
Column B. Distribute the denominator to each term in the numerator, then cancel common
terms:

QUESTION: 28

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