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

It is currently 20 Aug 2018, 21:12

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 list consists of 3 different members. Does the med

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
User avatar
Joined: 23 Nov 2008
Posts: 76
A certain list consists of 3 different members. Does the med  [#permalink]

Show Tags

New post 27 Nov 2008, 02:39
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

36% (00:50) correct 64% (00:40) wrong based on 11 sessions

HideShow timer Statistics

A certain list consists of 3 different members. Does the median of the 3 numbers equal the average (arithmetic mean) of the 3 numbers?

(1) The range of the 3 numbers is equal to twice the difference between the greatest number and the median
(2) The sum of the 3 numbers is equal to 3 times one of the numbers

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Manager
Manager
avatar
Joined: 08 Aug 2008
Posts: 226
Re: DS: Median  [#permalink]

Show Tags

New post 27 Nov 2008, 03:04
D.
the ques asks if the nos are consecutive or the no.s are equidistant from each other in which case we'll have mean=median.
(1)if nos. are A,B,C with B as median, C-A=2(C-B)
or C-B=B-A ---suff
(2)Tricky . we can have A+B+C=3A or A+B+C=3B or A+B+C=3C.
in each case, however A,B &C will be the medians and hence suffice.
(since all nos. are different)
Manager
Manager
avatar
Joined: 27 May 2008
Posts: 192
Re: DS: Median  [#permalink]

Show Tags

New post 28 Nov 2008, 22:20
A certain list consists of 3 different members. Does the median of the 3 numbers equal the average (arithmetic mean) of the 3 numbers?
1) The range of the 3 numbers is equal to twice the difference between the greatest number and the median
2) The sum of the 3 numbers is equal to 3 times one of the numbers

here is my approach,

let the numbers be x,y,z
is mean = median? basically we have to prove weather all the numbers are same or consecutive, OK letz prove it,

assuming x,y,x in ascending order,

1) z-x = 2(z-y)

y = (z+x)/2 -- median ---- 1

mean = (x+y+z)/3 -- 2

sub 1 in 2 we get mean == median

2) x+y+z = 3y ( since all are diff numbers, only y is eligible)

so it just repeats the above soln.

SO D

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: DS: Median &nbs [#permalink] 28 Nov 2008, 22:20
Display posts from previous: Sort by

A certain list consists of 3 different members. Does the med

  post reply Question banks Downloads My Bookmarks Reviews Important topics  

Events & Promotions

PREV
NEXT


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®.