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 1612:00 PM EDT
-11:59 PM EDT
You’re first to know: Save $200 on GMAT prep starting tomorrow, 4/13. Get 6 official practice tests and study with real questions. Be ready to save!
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.
22 Jun 2021, 01:30
Kudos
Bookmarks
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
65% (01:07) correct
35%
(00:54)
wrong
based on 116
sessions
History
Date
Time
Result
Not Attempted Yet
What is the standard deviation of the terms in set N?
(1) Every prime number in a specific range appears exactly once in set N.
(2) All terms in set N range between 20 and 50.
(1) Every prime number in a specific range appears exactly once in set N.
(2) All terms in set N range between 20 and 50.
22 Jun 2021, 07:51
Kudos
Bookmarks
Bunuel
What is the source? The wording is too imprecise for the question to be interpreted unambiguously, and it is using the term 'range', which has a specific meaning in Statistics, to mean something other than 'range'. I'm not sure what "range" even means here, because often when we say "range" in phrases similar to that used in this question, we mean that the endpoints are automatically included. If you say "salaries at Company X range from $20,000 to $100,000", that means one salary definitely is $20,000, and another definitely is $100,000. Does Statement 2 here mean to suggest that 20 and 50 are both in the set? I can't tell.
But as I'd interpret the wording, we know almost nothing about N even using both Statements, besides the fact that its elements lie between 20 and 50. Our set could be
{23, 27}
say, because "every prime number in a specific range (the range from 21 to 25, say) appears exactly once", and all of the terms are between 20 and 50. Or the set could be
{23, 49}
for the same reason, and these two sets clearly have different standard deviations. So E is the answer, as I read the question.
General Discussion
22 Jun 2021, 03:51
Kudos
Bookmarks
Statement (1) Every prime number in a specific range appears exactly once in set N.
We do not know the elements of the set; Hence, Not sufficient
Statement (2) All terms in set N range between 20 and 50.
We do not know the elements of the set; Hence, Not sufficient
Combined :
Language of the statement 1 is not very clear to me
Assuming it says set consists of elements which are prime number between a specific range and there are no other element. Statement 2 gives the specific range. so we know the elements of the set and hence the SD-Sufficient
If statement one imply there are other elements in the set along with prime numbers between specific range our answer when we combine two statements will remain Not sufficient
I pick C.
We do not know the elements of the set; Hence, Not sufficient
Statement (2) All terms in set N range between 20 and 50.
We do not know the elements of the set; Hence, Not sufficient
Combined :
Language of the statement 1 is not very clear to me
Assuming it says set consists of elements which are prime number between a specific range and there are no other element. Statement 2 gives the specific range. so we know the elements of the set and hence the SD-Sufficient
If statement one imply there are other elements in the set along with prime numbers between specific range our answer when we combine two statements will remain Not sufficient
I pick C.
