GMATinsight wrote:
What is the standard deviation of the set A?
1) Mean of the set A is 10
2) Range of the set A is 0
Source: http://www.GMATinsight.com
Statement 1: gives only the information regarding mean but we know nothing about the numbers and their average. hence insufficient
Statement 2: Essentially this statement means that all numbers in the set areEQUAL . Since, Range = Max -
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