GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 16 Oct 2018, 11:47

Close

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

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

A certain characteristic in a large population has a distribution that

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Math Revolution GMAT Instructor
User avatar
V
Joined: 16 Aug 2015
Posts: 6369
GMAT 1: 760 Q51 V42
GPA: 3.82
Premium Member
A certain characteristic in a large population has a distribution that  [#permalink]

Show Tags

New post 30 Mar 2016, 00:27
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

84% (01:45) correct 16% (01:53) wrong based on 73 sessions

HideShow timer Statistics

A certain characteristic in a large population has a distribution that is symmetric about the mean m. 68 percent of the distribution lies within one standard deviation d of the mean. If the shelf’s average life is 9.6 years and the standard deviation is 2.1 years, what percent of the distribution has more than 11.7 years as a shelf’s average life?

A. 10%
B. 12%
C. 14%
D. 16%
E. 18%


* A solution will be posted in two days.

_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only $99 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"

SC Moderator
User avatar
D
Joined: 13 Apr 2015
Posts: 1694
Location: India
Concentration: Strategy, General Management
GMAT 1: 200 Q1 V1
GPA: 4
WE: Analyst (Retail)
GMAT ToolKit User Premium Member
Re: A certain characteristic in a large population has a distribution that  [#permalink]

Show Tags

New post 30 Mar 2016, 11:26
3
1
Average = 9.6
SD = 2.1

9.6 - 2.1 < 68% of distribution < 9.6 + 2.1
7.5 < 68% of distribution < 11.7

32% is outside this range.

Given: Distribution is symmetric. So 16% of distribution is less than 7.5 and the other 16% of distribution is greater than 11.7.

Answer: D

P.S: This question is similar to OG question: a-certain-characteristic-in-a-large-population-has-a-143982.html
Math Revolution GMAT Instructor
User avatar
V
Joined: 16 Aug 2015
Posts: 6369
GMAT 1: 760 Q51 V42
GPA: 3.82
Premium Member
Re: A certain characteristic in a large population has a distribution that  [#permalink]

Show Tags

New post 03 Apr 2016, 02:45
1
A certain characteristic in a large population has a distribution that is symmetric about the mean m. 68 percent of the distribution lies within one standard deviation d of the mean. If the shelf’s average life is 9.6 years and the standard deviation is 2.1 years, what percent of the distribution has more than 11.7 years as a shelf’s average life?

A. 10%
B. 12%
C. 14%
D. 16%
E. 18%

Attachment:
Standard normal distribution.jpg
Standard normal distribution.jpg [ 17.18 KiB | Viewed 1120 times ]

Like the above picture, what is bigger than 11.7 is 0.16=16%.
Thus, D is the answer.
_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only $99 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 49915
Re: A certain characteristic in a large population has a distribution that  [#permalink]

Show Tags

New post 03 Apr 2016, 11:34
MathRevolution wrote:
A certain characteristic in a large population has a distribution that is symmetric about the mean m. 68 percent of the distribution lies within one standard deviation d of the mean. If the shelf’s average life is 9.6 years and the standard deviation is 2.1 years, what percent of the distribution has more than 11.7 years as a shelf’s average life?

A. 10%
B. 12%
C. 14%
D. 16%
E. 18%


* A solution will be posted in two days.


Similar question to practice: a-certain-characteristic-in-a-large-population-has-a-143982.html
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 8419
Premium Member
Re: A certain characteristic in a large population has a distribution that  [#permalink]

Show Tags

New post 30 Jun 2017, 06:57
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.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

GMAT Club Bot
Re: A certain characteristic in a large population has a distribution that &nbs [#permalink] 30 Jun 2017, 06:57
Display posts from previous: Sort by

A certain characteristic in a large population has a distribution that

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.