Events & Promotions
|
|
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Apr 2601:30 AM EDT
-02:30 AM EDT
Learn how Keshav, a Chartered Accountant, scored an impressive 705 on GMAT in just 30 days with GMATWhiz's expert guidance. In this video, he shares preparation tips and strategies that worked for him, including the mock, time management, and more.
Apr 2512:30 AM EDT
-01:30 AM EDT
At one point, she believed GMAT wasn’t for her. After scoring 595, self-doubt crept in and she questioned her potential. But instead of quitting, she made the right strategic changes. The result? A remarkable comeback to 695. Check out how Saakshi did it.
Apr 2610:00 AM EDT
-11:00 AM EDT
The Target Test Prep course represents a quantum leap forward in GMAT preparation, a radical reinterpretation of the way that students should study. Try before you buy with a 5-day, full-access trial of the course for FREE!
Apr 2711:00 AM EDT
-12:00 PM EDT
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors
Apr 2808:00 AM PDT
-11:00 AM PDT
Whether you are just beginning your MBA journey or fine-tuning your path to a 700+ score, GMAT Day is designed to give you a competitive edge.
May 0111:00 AM PDT
-12:00 PM PDT
Free- full-length test + 15 concept videos + 150+ short videos + study plan!
29 Nov 2020, 22:00
Kudos
Bookmarks
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
68% (02:18) correct
32%
(02:11)
wrong
based on 19
sessions
History
Date
Time
Result
Not Attempted Yet
sabrinaZ
Please refer to the diagram below for the normal distribution.
50% lies below the mean. Also since 68% lies between 1 standard deviation, 34% lies below the mean and 34% lies above the mean.
Those who scored between 400 and 500 is 34% of the students = 10,200
So, \(\frac{34}{100} * Total \space Students = 10200\)
Total Students = \(\frac{100}{34} * 10200 = 30000\)
1 standard deviation above the mean = 500 + 100 = 600. So 50 + 34 = 84% lies up to 1 standard deviation above the mean.
The remaining is 16%. Therefore the number of students = 16% of 30000 = 4800
Option B
Arun Kumar
This Question is Locked Due to Poor Quality
Hi there,
The question you've reached has been archived due to not meeting our community quality standards. No more replies are possible here.
Looking for better-quality questions? Check out the 'Similar Questions' block below
for a list of similar but high-quality questions.
Want to join other relevant Problem Solving discussions? Visit our Problem Solving (PS) Forum
for the most recent and top-quality discussions.
Thank you for understanding, and happy exploring!
30 Nov 2020, 10:58
Kudos
Bookmarks
sabrinaZ
You do not need to know a thing about "normal distributions" for the GMAT, so if a question were to ask about them, it would need to tell you, within the question itself, everything you need to know about them. This question does not do that, and it's unanswerable as written (unless you bring to it outside knowledge about normal distributions). The "normal distribution" is an infinite distribution, so this question is flawed from the outset - the best it can say is that this finite set is "approximately normal". But the crucial piece of information the question is missing is that normal distributions are symmetric. Without that information, you can't do anything here.
Since an approximately normal distribution is symmetric, of the 68% of values within one standard deviation of the mean, 34% will be above the mean, and 34% will be below the mean (assuming no values equal the mean, which is something very likely to be true of the SAT scores in this question, another grievous error in the question design). So here, at least guessing what the question intends, 10,200 represents 34% of all test scores. Further, if 68% of scores are within one standard deviation of the mean, the rest, or 32%, are more than one standard deviation away from the mean. Since a normal distribution is symmetric, half of those, or 16%, will be more than one standard deviation above the mean.
We know 10,200 represents 34% of all values, and we're trying to find what number represents 16% of all values, so the answer is just (16/34)(10,200), which is clearly less than half of 10,200, but not by much, so 4800 will be correct.
But this is a very badly conceived problem, and is not something the GMAT could ever ask. What is the source?
This Question is Locked Due to Poor Quality
Hi there,
The question you've reached has been archived due to not meeting our community quality standards. No more replies are possible here.
Looking for better-quality questions? Check out the 'Similar Questions' block below
for a list of similar but high-quality questions.
Want to join other relevant Problem Solving discussions? Visit our Problem Solving (PS) Forum
for the most recent and top-quality discussions.
Thank you for understanding, and happy exploring!
