Graduate Management Admission Test Quantitative Reasoning Exam Version 3 Questions

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The variance of a data set is the arithmetic mean of the squared differences between the elements of the data set and the arithmetic mean of the data set. For example the arithmetic mean of the data set consisting of 2 7 and 9 is (2+7+9)/3 which is 6 and the variance is [(2-6)^2 + (7-6)^2 + (9-6)^2]/3 which is 26/3. What is the variance of the data set consisting of 3 4 5 6 and 7?
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