Official Guide Explanation:
Data Sufficiency #41




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Solution and Metadata

Question: 41
Page: 156
Difficulty: 5 (Moderate)
Category 1: Arithmetic > Descriptive Statistics > other
Category 2: Algebra > Inequalities > other

Explanation: To determine the range, you need the know the value of the largest and smallest numbers in the set. (The range is the difference between those two numbers.) Statement (1) is sufficient: if w and z are the largest and smallest numbers, the range is greater than 2; if they are not, the range is still greater. Statement (2) is insufficient, as it indicates nothing of the difference between any numbers in the set. Choice (A) is correct.

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