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.
Jul 2006:30 AM PDT
-08:30 AM PDT
Stuck at a score plateau and struggling to hit your target score? Join this Masterclass to understand how you should turn around your prep to reach your goal in just 40 days. Discover what top scorers know that you don’t!
Jul 2006:30 AM PDT
-07:45 AM PDT
A GRE quant practice session to solve 15 tough questions from Counting Methods concepts tested in GRE quant section. Take this quiz with other test takers in timed conditions, analyze your GRE study progress, and more.- Jul 20
07:30 AM PDT
-08:30 AM PDT
Join us in a live GMAT quant practice session to solve 10 tough questions from word problems and overlapping sets concepts tested in GMAT quant section. Take this quiz with other test takers in timed conditions. - Jul 20
10:00 AM PDT
-11:00 AM PDT
Join us in a live GMAT Verbal practice session to solve 10 tough questions from the Reading Comprehension section tested in the GMAT Verbal section. Take this quiz with other test takers in timed conditions. 
Jul 1410:00 AM PDT
-11:59 PM PDT
GMAT Preparation Online - A limited time sale use code: EXPERTSGLOBAL10
Jul 1703:00 PM IST
-11:00 AM IST
Start your journey with a fully customized action plan and work with a dedicated mentor to achieve a 735+ score.- Jul 19
09:00 AM PDT
-11:00 AM PDT
Struggling to stay on time during Multi-Source Reasoning (MSR) questions on the GMAT? In this video, GMAT expert Karishma Bansal (founder of ANA Prep) breaks down a 3-minute scanning strategy that can help you save critical time... 
Jul 1911:30 AM EDT
-12:30 PM EDT
Struggling to find the right strategies to score a 99 %ile on GMAT Focus? Riya (GMAT 715) boosted her score by 100-points in just 15 days! Discover how the right mentorship, tailored strategies, and an unwavering mindset can transform your GMAT prep.- Jul 22
08:30 AM PDT
-09:30 AM PDT
LIVE Q&A with Shrutav Donde | Perfect 805 GMAT Scorer Join us for an exclusive live session with Shrutav, who achieved the rarest of achievements - a perfect 805 GMAT score with Q90, V90, and DI90. - Jul 22
10:00 AM PDT
-11:00 AM PDT
In our second video about test accommodations for the GMAT exam, GMAT Ninja’s founder chats with Jason Northrup, Test Accommodations Senior manager at GMAC, about the three main qualifying condition categories... - Jul 23
08:00 PM PDT
-09:00 PM PDT
Full-length FE mock with insightful analytics, weakness diagnosis, and video explanations! 
Jul 2410:00 AM EDT
-11:00 AM EDT
More Target Test Prep students are earning 100th percentile GMAT scores. Don’t settle for less when the Target Test Prep course gives you everything you need to score high on the GMAT. Start your 5-day free trial today.
Jul 2510:00 AM EDT
-11:00 AM 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..- Jul 26
11:00 AM IST
-01:00 PM IST
Attend this session to learn how to Deconstruct arguments, Pre-Think Author’s Assumptions, and apply Negation Test.
12 Jul 2013, 09:08
Kudos
Bookmarks
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
43% (01:56) correct
57%
(02:03)
wrong
based on 389
sessions
History
Date
Time
Result
Not Attempted Yet
Set A consists of five different numbers; set B consists of four different numbers, each of which is in set A. Is the standard deviation of set A less than the standard deviation of set B ?
(1) Set A contains five consecutive integers.
(2) The average (arithmetic mean) of set A is equal to the average (arithmetic mean) of set B.
(1) Set A contains five consecutive integers.
(2) The average (arithmetic mean) of set A is equal to the average (arithmetic mean) of set B.
How do you solve statement 2 I landed on one lucky example( set A 0 10 20 30 40 and set B 0 10 30 40) and guessed it to be sufficient. Can someone provide a detailed analysis... Thanks!
12 Jul 2013, 09:31
Kudos
Bookmarks
Set A consists of five different numbers; set B consists of four different numbers, each of which is in set A. Is the standard deviation of set A less than the standard deviation of set B ?
(1) Set A contains five consecutive integers. A={1, 2, 3, 4, 5} and B={1, 2, 4, 5}, then SD(A)<SD(B) (since A is obtained by adding the element equal to the mean to set B) but if A={1, 2, 3, 4, 5} and B={1, 2, 3, 4}, then SD(A)>SD(B) (since B is less widespread than A). Not sufficient.
(2) The average (arithmetic mean) of set A is equal to the average (arithmetic mean) of set B. If we add to a set new element, which is equal to the mean of the original set, then the standard deviation decreases (well if the SD was not 0). We know that A is obtained by adding one element to set B. Since doing so the mean of A does not change, then we added the element which was equal to the mean, thus we decreased the standard deviation --> SD(A)<SD(B). Sufficient.
Answer: B.
Hope it's clear.
(1) Set A contains five consecutive integers. A={1, 2, 3, 4, 5} and B={1, 2, 4, 5}, then SD(A)<SD(B) (since A is obtained by adding the element equal to the mean to set B) but if A={1, 2, 3, 4, 5} and B={1, 2, 3, 4}, then SD(A)>SD(B) (since B is less widespread than A). Not sufficient.
(2) The average (arithmetic mean) of set A is equal to the average (arithmetic mean) of set B. If we add to a set new element, which is equal to the mean of the original set, then the standard deviation decreases (well if the SD was not 0). We know that A is obtained by adding one element to set B. Since doing so the mean of A does not change, then we added the element which was equal to the mean, thus we decreased the standard deviation --> SD(A)<SD(B). Sufficient.
Answer: B.
Hope it's clear.
General Discussion
25 Dec 2023, 13:22
Kudos
Bookmarks
Hello from the GMAT Club BumpBot!
Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
