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

It is currently 17 Nov 2018, 09:24

Gmatbusters' Weekly Quant Quiz

Join here 


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
Events & Promotions in November
PrevNext
SuMoTuWeThFrSa
28293031123
45678910
11121314151617
18192021222324
2526272829301
Open Detailed Calendar
  • FREE Quant Workshop by e-GMAT!

     November 18, 2018

     November 18, 2018

     07:00 AM PST

     09:00 AM PST

    Get personalized insights on how to achieve your Target Quant Score. November 18th, 7 AM PST
  • How to QUICKLY Solve GMAT Questions - GMAT Club Chat

     November 20, 2018

     November 20, 2018

     09:00 AM PST

     10:00 AM PST

    The reward for signing up with the registration form and attending the chat is: 6 free examPAL quizzes to practice your new skills after the chat.

The table above shows the distribution of the number

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

Hide Tags

Senior Manager
Senior Manager
User avatar
Joined: 21 Oct 2013
Posts: 419
The table above shows the distribution of the number  [#permalink]

Show Tags

New post 27 Mar 2014, 15:56
1
18
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

69% (01:23) correct 31% (01:30) wrong based on 356 sessions

HideShow timer Statistics

Attachment:
File comment: Table
Table1.png
Table1.png [ 19.85 KiB | Viewed 5921 times ]

The table above shows the distribution of the number of absences from certain English class during the spring semester. For those students who had at least 1 absence, what was the median number of absences?

A) 1.5
B) 2
C) 2.5
D) 3
E) 3.5

OE:
When students who did not have at least 1 absence are eliminated, there are 28 - 4 = 24 students left.
The numbers of absences are then 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 4, 4, 4, 4, 4, 5 or more, 5 or more, 5 or more.
Because 24 is even, the median number of absences for the 24 students is the mean of the 12th and 13th highest number of absences.
Both of these numbers are 2 and so the median number of absences is 2.


Hi, it appears that number of precise absence in " 5 more" absence is not relevant to the median calculation.
Can anyone explain this to me, please.
Most Helpful Expert Reply
Veritas Prep GMAT Instructor
User avatar
P
Joined: 16 Oct 2010
Posts: 8550
Location: Pune, India
Re: The table above shows the distribution of the number  [#permalink]

Show Tags

New post 27 Mar 2014, 20:03
4
1
2
goodyear2013 wrote:
Attachment:
Table1.png

The table above shows the distribution of the number of absences from certain English class during the spring semester. For those students who had at least 1 absence, what was the median number of absences?

A) 1.5
B) 2
C) 2.5
D) 3
E) 3.5

OE:
When students who did not have at least 1 absence are eliminated, there are 28 - 4 = 24 students left.
The numbers of absences are then 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 4, 4, 4, 4, 4, 5 or more, 5 or more, 5 or more.
Because 24 is even, the median number of absences for the 24 students is the mean of the 12th and 13th highest number of absences.
Both of these numbers are 2 and so the median number of absences is 2.


Hi, it appears that number of precise absence in " 5 more" absence is not relevant to the median calculation.
Can anyone explain this to me, please.



Yes, it isn't and the reason is this:
In the list {2, 4, 8, 10, 11, 13, 17, 20, 10098}, what is the median? It is 11. Since the total number of items is 9 so median is the middle element i.e. the fifth element.
Does 10098 play any role in the median? No!

Similarly, your list here looks like this:
1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 4, 4, 4, 4, 4, 5 or more, 5 or more, 5 or more
It doesn't matter what the last three items are. The median will be the average of the 12th and the 13 the term since there are a total of 24 terms (3+10+3+5+3). Both 12th and 13th terms are 2 so median will be 2.
_________________

Karishma
Veritas Prep GMAT Instructor

Learn more about how Veritas Prep can help you achieve a great GMAT score by checking out their GMAT Prep Options >

GMAT self-study has never been more personalized or more fun. Try ORION Free!

General Discussion
Retired Moderator
avatar
Joined: 29 Oct 2013
Posts: 265
Concentration: Finance
GPA: 3.7
WE: Corporate Finance (Retail Banking)
GMAT ToolKit User
Re: The table above shows the distribution of the number  [#permalink]

Show Tags

New post 03 Jun 2014, 20:12
2
The total no of students with at the least 1 absence is 3+10+3+5+3 = 24
The median would be the average of 12th and 13th term: 2
Ans:B
_________________

Please contact me for super inexpensive quality private tutoring

My journey V46 and 750 -> http://gmatclub.com/forum/my-journey-to-46-on-verbal-750overall-171722.html#p1367876

Manager
Manager
avatar
Joined: 24 Oct 2012
Posts: 63
WE: Information Technology (Computer Software)
Re: The table above shows the distribution of the number  [#permalink]

Show Tags

New post 05 Oct 2014, 12:19
Hi
I am finding it difficult to understand wording of this question. How are these series deducted from the question?

1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 4, 4, 4, 4, 4, 5 or more, 5 or more, 5 or more

Thanks
Veritas Prep GMAT Instructor
User avatar
P
Joined: 16 Oct 2010
Posts: 8550
Location: Pune, India
Re: The table above shows the distribution of the number  [#permalink]

Show Tags

New post 06 Oct 2014, 01:27
1
GMatAspirerCA wrote:
Hi
I am finding it difficult to understand wording of this question. How are these series deducted from the question?

1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 4, 4, 4, 4, 4, 5 or more, 5 or more, 5 or more

Thanks


The table gives the number of students for each number of absences. There are 4 students with 0 absences, 3 students with 1 absence each, 10 students with 2 absences etc.

Now if you write down the number of absences of all students in the class in ascending order, you will do something like this:
0 (1st student's absences), 0 (2nd student's absences), 0 (3rd student's absences), 0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3 ... and so on...
(there are 4 students with 0 absences, 3 students with 1 absence etc)

If you need to write the number of absences of students with at least one absence in ascending order, you will do the following:
1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3 ... and so on...

The median number of absences i.e. average of 12th student and 13th student will be average of 2 and 2 which will be 2. So median number of absences will be 2.
_________________

Karishma
Veritas Prep GMAT Instructor

Learn more about how Veritas Prep can help you achieve a great GMAT score by checking out their GMAT Prep Options >

GMAT self-study has never been more personalized or more fun. Try ORION Free!

Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 8801
Premium Member
Re: The table above shows the distribution of the number  [#permalink]

Show Tags

New post 19 Jul 2018, 23:20
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: The table above shows the distribution of the number &nbs [#permalink] 19 Jul 2018, 23:20
Display posts from previous: Sort by

The table above shows the distribution of the number

  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®.