Statistical “Combo” Problems
Today we’re going to talk about statistics problems in which we have to combine knowledge of more than oneconcept.Try this GMATPrep problem first; set your timer for 2 minutes and go!
Last month 15 homes were sold in Town X. The average (arithmetic mean) sale price of the homes was $150,000 and the median sale price was $130,000. Which of the following statements must be true?
I. At least one of the homes was sold for more than $165,000.
II. At least one of the homes was sold for more than 130,000 and less than 150,000.
III. At least one of the homes was sold for less than $130,000.
(A) I only
(B) II only
(C) III only
(D) I and II
(E) I and III
Sigh. I hate roman numeral questions. I have to do more work to solve the problem, and I never like that. : )
Challenge Problem Showdown – January 16th, 2012
We invite you to test your GMAT knowledge for a chance to win! Each week, we will post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that week’s drawing for a free Manhattan GMAT Prep item. Tell your friends to get out their scrap paper and start solving!
Here is this week’s problem:
If x is positive and not equal to 1, then the product of x1/n for all positive integers n such that 21 ≤ n ≤ 30 is between
Modifiers and Meaning: a GMATPrep Sentence Correction Problem
Modifiers have always been commonly tested on the GMAT and emphasis on meaning has increased recently. In addition, these two areas can often be quite tricky “ it’s hard to articulate exactly what the issues are sometimes. So let’s try talking one through. This problem is from GMATPrep. Set your timer for 1 minute 15 seconds and go for it!
* “Initiated five centuries after Europeans arrived in the New World on Columbus Day 1992, Project SETI pledged a $100 million investment in the search for extraterrestrial intelligence.
(A) Initiated five centuries after Europeans arrived in the New World on Columbus Day 1992, Project SETI pledged a $100 million investment in the search for extraterrestrial intelligence.
(B) Initiated on Columbus Day 1992, five centuries after Europeans arrived in the New World, a $100 million investment in the search for extraterrestrial intelligence was pledged by Project SETI.
(C) Initiated on Columbus Day 1992, five centuries after Europeans arrived in the New World, Project SETI pledged a $100 million investment in the search for extraterrestrial intelligence.
(D) Pledging a $100 million investment in the search for extraterrestrial intelligence, the initiation of Project SETI five centuries after Europeans arrived in the New World on Columbus Day 1992.
(E) Pledging a $100 million investment in the search for extraterrestrial intelligence five centuries after Europeans arrived in the New World, on Columbus Day 1992, the initiation of Project SETI took place.
As we discuss this problem, I really want you to think about how to articulate why something is incorrect (or correct). Pretend you’re the teacher and you have to explain it to your students. Also, I’m going to give us a bit of a handicap. You aren’t allowed to use this reason: It changes the original meaning of the sentence.
Do you want to be a Social Venture Scholar?
We are excited to announce that we are now accepting applications for our Winter 2012 Social Venture Scholars (SVS) program. For those unfamiliar with the program, it was launched in 2007 with the goal of making GMAT prep more accessible to MBA-hopefuls working in the non-profit sector. The very first SVS class was taught by our founder, Zeke Vanderhoek. Over the past 5 years we have run 6 SVS programs and helped dozens of deserving individuals get a step closer to business school. Past SVS students have gone on to gain admission to competitive business schools (such as Columbia and Duke), and have used their degrees to advance and found organizations dedicated to positive social change.
Recipients of our SVS scholarship receive free enrollment into a dedicated Live Online GMAT prep course (a $1090 value). Up to 25 scholarships will be awarded to applicants who (1) currently work full-time in an organization that promotes positive social change, (2) plan to use their MBA to work in a public, not-for-profit, or other venture with a social-change oriented mission, and (3) demonstrate clear financial need. This year’s SVS course will begin on Monday, February 20th.
For complete details and application requirements, visit our Social Venture Scholars page. Applications for the Winter 2012 program are due on February 1st. Good luck!
Challenge Problem Showdown – January 9th, 2012
We invite you to test your GMAT knowledge for a chance to win! Each week, we will post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that week’s drawing for a free Manhattan GMAT Prep item. Tell your friends to get out their scrap paper and start solving!
Here is this week’s problem:
If k is a positive integer, which of the following must be divisible by 24?
Friday Links
Here is what happened in the world of GMAT this week…
- Poets and Quants ranked the top 50 Non-U.S. MBA Programs.
- The Wall Street Journal took a look at the finances of Business Schools (subscription required).
- Our friends at mbaMission looked at how an MBA can increase income mobility.
Have a great weekend, everybody!
Stress Management
Everyone struggles with some amount of anxiety when taking a test like the GMAT, but some people struggle more than others. Stress can also affect your preparation before you ever get to the test center “ if you’re too stressed out when studying, that will hurt your ability to make and recall memories. So what can we do to reduce studying and test-taking stress?
Know what’s coming
The more you’re prepared for what you’re going to face, the less stressed you’ll be. This won’t completely eliminate your anxiety “ nothing will “ but it can help to reduce stress to more manageable levels.
One major source of stress on this test is the feeling that you need to get everything right (and getting stressed out when you hit questions that you know you’re getting wrong). Read this article: In It To Win It. The nutshell: you’re not trying to get everything right. Nobody gets everything right, including me and other 99th percentile testers!
What to Read—and What Not to Read—on RC Passages
Did you know that you can attend the first session of any of our online or in-person GMAT courses absolutely free? We’re not kidding! Check out our upcoming courses here.
A student recently asked me to show an example of how I read and take notes on a reading comprehension passage. In this older article, I discussed how to read through a RC passages in general, but I didn’t show an example. If you haven’t already read the older article, read that first; then come back here to see an example. Read more
Challenge Problem Showdown – January 2nd, 2012
We invite you to test your GMAT knowledge for a chance to win! Each week, we will post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that week’s drawing for a free Manhattan GMAT Prep item. Tell your friends to get out their scrap paper and start solving!
Here is this week’s problem:
If x and y are both integers chosen at random between 1 and 100, inclusive, what is the approximate probability that x/y is an integer?
Manhattan GMAT Holiday Food Drive
This December, the team at Manhattan Prep ran its first holiday season food & toy drive. Manhattan Prep staff, Instructors and students at our New York City headquarters contributed games, stuffed animals, food items, and spare change to the efforts. In just over two weeks, we collected over 100 items of food, donated to City Harvest, and over 40 toys for Toys for Tots.
The United States Marines’ Toys for Tots program collects toys between October and December every year for children who otherwise wouldn’t have any gifts to open during the holidays. City Harvest, a New York-based nonprofit, collects food year-round to support its many community programs aimed at feeding New York City’s hungry. We’re thrilled to be supporting such worthy organizations. Thanks to all who contributed!