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Archive | Statistics

Common GMAT Topic: Descriptive Statistics

Here’s a whirlwind tour of one of the most frequently tested sets of concepts on the GMAT Quantitative section: GMAT statistics. You don’t have to be an expert on statistics: a little goes a long way. Let’s learn some basic descriptive statistics formulas and go from there. Descriptive Statistics Formulas The Mean One very important GMAT […]

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Standard Deviation on the GMAT

First, here are some challenging practice questions: 1) Set S has a mean of 10 and a standard deviation of 1.5.  We are going to add two additional numbers to Set S.  Which pair of numbers would decrease the standard deviation the most? (A) {2, 10} (B) {10, 18} (C) {7, 13} (D) {9, 11} […]

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