Recently, statistics have become an integral part of the GRE exam. Apart from the problems on mean or average, there is a high possibility of finding multiple questions on standard deviation, median, mode, and range. Hence, ignoring this section during your preparation for GRE can affect your score adversely.

But firstly, we should understand why people usually dodge this topic. When it comes to statistics even the savviest of test- takers cringe, but you can be the one to excel this topic with utmost ease. Let us understand the topics one at a time that comprises to make the syllabus of numerical methods for describing data of the data analysis in GRE quantitative aptitude section.

**Mean: **Both mean and arithmetic mean can be commonly recognized by its alternate name of Average in GRE exam. Irrespective of the name we use to call it, the methods of calculation are always the same and that is, add all the values and divide it by the number of terms. Undoubtedly you would have seen questions based on mean in your high schools.

Hence the formula can be represented mathematically as

\(\large Mean = \frac{Summation \; of \; all \; Terms}{Number \; of \; Terms}\)

**Median:** For a group of numbers, to calculate the median, the middle term is taken as the median value, when the numbers are written in either descending or ascending order. Hence, it is easy to comprehend that for calculating median it is important for you first to rewrite the terms in either descending or ascending order. But what to do if there are two middle terms, in that case, which one to choose? Well, it is easy, if two numbers are appearing in the middle, simply take the mean of the two and this mean will give you the median value. For a list of consecutive numbers, you don’t need to break a sweat. Just add the first term and the last term and divide it by 2, you will get the intermediate value.

So the formula used can be

\(\large Median = \frac{First \; Term + Last \; Term}{2}\)

**Mode:** For a group of numbers, the mode will be the number that has occurred most frequently. If more than one number is taut for first place in the race to befall the most, then the group will have multiple modes.

**Range:** The range of a set of number can be calculated by taking the difference of the largest term and the smallest term.

**Standard Deviation:** Even though standard deviation is the most complex concept of statistics but luckily for GRE you will need only the basics. GRE won’t ask you to actually calculate the standard deviation as the formula is bit complicated and calculation can take a lot more time than anticipated. But you will be expected to know what standard deviation is. Standard deviation is a measure of how assorted out a group of values is. The more spread out the group will be, the larger will be its standard deviation.