Descriptive Statistics (Statistics and Averages) is a topic from which you could expect 2 to 3 questions in the GMAT quant section. This topic is an important one. The data sufficiency variant in this topic could feature GMAT hard math questions.
Using Wizako's GMAT Prep Material for this topic invest a minimum of 10 hours on the topic.
Basics concepts of statistics including averages (arithmetic mean), mode, median, standard deviation, variance, and range are often tested in the GMAT exam. Questions from this topic appear in both the GMAT Problems Solving and in the GMAT Data Sufficiency variant. A good grasp of the fundamentals of these concepts will help you crack questions GMAT statistics and averages with relative ease. Wizako's GMAT Math Lesson Book in this chapter covers the following concepts:
Here is a typical solved example in Wizako's GMAT Book from this chapter
If x > 14, what is the median of the set consisting of the following numbers: 10, 12, 14, 7, 15, 19, and x?
Arrange the six terms whose values are known in ascending order: 7, 10, 12, 14, 15, and 19.
When x is included, we have seven terms; the median will be the fourth term.
Because x > 14, x will appear to the right of 14 in the sequence.
The 4th term of the sequence, irrespective of where x appears to the right of 14, will be 14.
Therefore, the median is 14.
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