It is currently 19 Nov 2017, 23:32

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# GMATPrep - Median, Mean

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
Manager
Joined: 28 Dec 2006
Posts: 60

Kudos [?]: [0], given: 0

GMATPrep - Median, Mean [#permalink]

### Show Tags

04 May 2007, 13:44
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Can anyone explain this ?
Attachments

GMATPrep2_Q11.jpg [ 25.09 KiB | Viewed 744 times ]

Kudos [?]: [0], given: 0

Manager
Joined: 18 Apr 2007
Posts: 120

Kudos [?]: 5 [0], given: 0

### Show Tags

04 May 2007, 14:24
The answer is B and this is how I got it:

We know that the median length is 140. This means that there are at least 2 pieces that are less than or equal to 140 and 2 pieces that are greater than or equal to 140.

using the avg equation of x+x/n=avg we know that the sum of all the pieces is 620.

Now, to make things easy on us, let's assume that the two shorter pieces are both 110 (I'm starting at C because it's in the middle). If we put those into the equation we get: 110+110+140+x+x=620, which simplifies to 2x=260

We know that these last two lengths (x) have to be greater than or equal to 140. So if we assume that they are equal to each other they have to be 130 each. This is less than the median, so answer C is not correct and you know you have to go lower.

If you try 100 you get 100+100+140+x+x=620 which simplifies to 340+2x=620 --> 2x=280 --> x=140. This satisifies the median requirement so the answer is B.

Kudos [?]: 5 [0], given: 0

Senior Manager
Joined: 03 May 2007
Posts: 270

Kudos [?]: 14 [0], given: 0

### Show Tags

04 May 2007, 16:04
that's how is did it

we know that mean of 5 numbers is 124 therefore sum of all number is 620
median is the middle number of sequence N1, N2, 140, N4, N5
we have to take the minimum possible number that is >=140 N4 and N5 and it is 140

so we have N1,N2, 140,140,140

We are interested in finding N1.

620-3*140=200
because all numbers are sorted the maximum number we can take is 200/2 =100

answer is 100

Kudos [?]: 14 [0], given: 0

04 May 2007, 16:04
Display posts from previous: Sort by

# GMATPrep - Median, Mean

 post reply Question banks Downloads My Bookmarks Reviews Important topics

Moderator: chetan2u

 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®.