Many quake in their boots when they hear that there will be Statistics covered on the GRE. They run to their college stats textbooks, dust off the cover, roll up their sleeves, and start computing the standard deviations of a list of twenty, three-digit numbers. Stop, if this in anyway describes you. The Statistics on [...]
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GRE Quartiles and the Interquartile Range
Statisticians point out that it’s often useful to “chunk” data to understand it. What does it mean to “chunk” data? It means dividing a long list into smaller chunks so that, with a few well-chosen numbers, we can get a sense of the layout of the list. The fundamental “chunking” number is the median. The [...]
Normal Distribution on the GRE
A distribution is a graph that shows what values of variable are more or less common in a population. Where the graph is higher, there are more people, and where the graph has a height close to zero, there are fewer people. By far, the most famous and most useful distribution is the Normal [...]
GRE Math Shortcut: Statistics
Consider the following question: Set T consists of all multiples of 5 from 30 to 225 inclusive Column A Column B Mean of Set T Median of Set T A. The quantity in Column A is greater B. The quantity in Column B is greater C. The two quantities are equal D. The relationship [...]
GRE Statistics
Below are the essentials to statistics on the GRE math section. These concepts are essential, so make sure you master them before walking into the test! Mean The mean is another way of saying average. To find the average add up the number of elements in the set and divide by the number of [...]
GRE Statistics: Conceptualizing Weighted Averages
Understanding Statistics (mean, median, and mode) questions on the GRE is becoming more sophisticated. You will not simply be asked to find the mean, but to think conceptually. For instance, let’s compare the following two problems: 1. What is the mean of 17, 23, 25, 36, 49? (A) 25 (B) 26 (C) 30 (D) 34 (E) 40 [...]
Statistics Practice Question of the Week #17 Answer
Here’s the answer to yesterday’s numeric entry question: Video Explanation: Hope the explanations helped! We’ll be posting the practice questions and answers on Monday and Tuesday, respectively, from now on so see you next Monday for another practice problem!
Statistics Practice Question of the Week #17
This week’s practice problem is a Numeric Entry question, so instead of choosing an answer from a set of given possibilities, you’ll type in your answer before you submit. Set A: {x, x, x, y, y, y, 3x+y, x–y } If the median of set A is 10 and 0 < x < y, what [...]
Math Strategies: Averages Are Rarely Average in Difficulty
An average day on the blog posts, so to speak. Today, we’ll deal with a topic that many students give short shrift – averages/mean. Oftentimes, the reason students don’t give them much consideration is that averages seem straightforward. Indeed, you may cavalierly shrug your shoulders, thinking “anyone can find the mean - just add up the [...]
GRE Math – Mean and Median (Sorry Mode, You Weren’t Invited)
Mean and Median This is an area of math that is oftentimes given short shrift. Many students think, hey, I know median and mode—those problems are easy. On the actual test, though, students oftentimes end up trying to solve a mean problem in a far more laborious and time-consuming way than is necessary. Take a [...]
