The results of a certain experiment included 6 data values : GMAT Data Sufficiency (DS)
Check GMAT Club App Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

It is currently 10 Dec 2016, 16:40
GMAT Club Tests

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

The results of a certain experiment included 6 data values

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

Hide Tags

Manager
Manager
User avatar
Joined: 06 Apr 2010
Posts: 143
Followers: 3

Kudos [?]: 637 [0], given: 15

Reviews Badge
The results of a certain experiment included 6 data values [#permalink]

Show Tags

New post 23 Jun 2010, 11:30
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

77% (01:49) correct 23% (01:03) wrong based on 125 sessions

HideShow timer Statistics

The results of a certain experiment included 6 data values that were all multiples of the same number c, namely, c, 8c, 2c, 5c, 4c, and 4c. Was the average (arithmetic mean) of the 6 data values greater than 8?

(1) c < 4
(2) c > 2
[Reveal] Spoiler: OA
Expert Post
2 KUDOS received
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 35951
Followers: 6866

Kudos [?]: 90120 [2] , given: 10418

Re: Need Solution for some DS problems from SET1 [#permalink]

Show Tags

New post 23 Jun 2010, 14:31
2
This post received
KUDOS
Expert's post
1
This post was
BOOKMARKED
udaymathapati wrote:
I have problem in solving following DS questions from SET1 (I don't know the source of this). Can anyone help me in resolvign them?

DS Questions: Need help

Q21:
The results of a certain experiment included 6 data values that were all multiples of the same number c, namely, c, 8c, 2c, 5c, 4c, and 4c. Was the average (arithmetic mean) of the 6 data values greater than 8?
(1) c < 4
(2) c > 2


\(Average=\frac{sum \ of \ terms}{# \ of \ terms}=\frac{c+8c+2c+5c+4c+4c}{6}=4c\). Question: is \(4c>8\)? --> is \(c>2\)?

(1) c < 4. Not sufficient.
(2) c > 2. Sufficient.

Answer: B.
_________________

New to the Math Forum?
Please read this: 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

CEO
CEO
User avatar
Status: Nothing comes easy: neither do I want.
Joined: 12 Oct 2009
Posts: 2795
Location: Malaysia
Concentration: Technology, Entrepreneurship
Schools: ISB '15 (M)
GMAT 1: 670 Q49 V31
GMAT 2: 710 Q50 V35
Followers: 224

Kudos [?]: 1596 [0], given: 235

Reviews Badge
Re: Need Solution for some DS problems from SET1 [#permalink]

Show Tags

New post 23 Jun 2010, 14:49
udaymathapati wrote:
I have problem in solving following DS questions from SET1 (I don't know the source of this). Can anyone help me in resolvign them?

DS Questions: Need help

Q21:
The results of a certain experiment included 6 data values that were all multiples of the same number c, namely, c, 8c, 2c, 5c, 4c, and 4c. Was the average (arithmetic mean) of the 6 data values greater than 8?
(1) c < 4
(2) c > 2



I want to advice you. Please do not get me wrong, this was an easy question. On real Gmat you will face tricky DS quant questions. I think you need to brush up your quant concepts using MGMAT guides, especially Number properties. Its good to build concepts first. After that start practicing.
I wish you good luck.
_________________

Fight for your dreams :For all those who fear from Verbal- lets give it a fight

Money Saved is the Money Earned :)

Jo Bole So Nihaal , Sat Shri Akaal

:thanks Support GMAT Club by putting a GMAT Club badge on your blog/Facebook :thanks

GMAT Club Premium Membership - big benefits and savings

Gmat test review :
http://gmatclub.com/forum/670-to-710-a-long-journey-without-destination-still-happy-141642.html

GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 09 Sep 2013
Posts: 12908
Followers: 563

Kudos [?]: 158 [0], given: 0

Premium Member
Re: The results of a certain experiment included 6 data values [#permalink]

Show Tags

New post 09 Jul 2015, 23:34
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

Expert Post
1 KUDOS received
EMPOWERgmat Instructor
User avatar
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 8019
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: 340 Q170 V170
Followers: 363

Kudos [?]: 2377 [1] , given: 163

Re: The results of a certain experiment included 6 data values [#permalink]

Show Tags

New post 10 Jul 2015, 15:15
1
This post received
KUDOS
Expert's post
Hi All,

Certain DS questions become easier to deal with if you 'rewrite' the question (as Bunuel showed in his explanation). For this prompt, you do not have to do that work to get the correct answer, but you will have to do some basic math regardless of how you approach the prompt.

Here, we're asked if the average of 6 terms (C, 8C, 2C, 5C, 4C and 4C) is greater than 8. This is a YES/NO question. Since the two Facts give us inequalities to work with, we can use each of them (individually) to figure out whether the average has a maximum or minimum possibility.

Fact 1: C < 4

We can use C = 4 as our "upper boundary"; in this case, the average of the 6 terms would be...

(4+32+8+20+16+16)/6 = 96/6 = 16

Since C is LESS than 4, the average of these 6 terms is LESS than 16.

IF....the average = 15, then the answer to the question is YES.
IF....the average = 0, then the answer to the question is NO.
Fact 1 is INSUFFICIENT

Fact 2: C > 2

Much as we did in Fact 1, we can use C = 2 as our "lower boundary"; in this case, the average of the 6 terms would be...

(2+16+4+10+8+8)/6 = 8

Since C is GREATER than 2, the average of these 6 terms is GREATER than 8.

Since the question asks if the average is greater than 8, the answer to the question is ALWAYS YES.
Fact 2 is SUFFICIENT.

Final Answer:
[Reveal] Spoiler:
B


GMAT assassins aren't born, they're made,
Rich
_________________

Rich Cohen

Co-Founder & GMAT Assassin

Special Offer: Save $75 + GMAT Club Tests

60-point improvement guarantee
www.empowergmat.com/

***********************Select EMPOWERgmat Courses now include ALL 6 Official GMAC CATs!***********************

Re: The results of a certain experiment included 6 data values   [#permalink] 10 Jul 2015, 15:15
    Similar topics Author Replies Last post
Similar
Topics:
9 Experts publish their posts in the topic If a number N is decreased by p percent and then the resulting value santorasantu 10 01 Oct 2015, 05:32
4 Experts publish their posts in the topic What is the value of 120(6)^x ? Bunuel 8 17 Feb 2015, 08:20
4 Experts publish their posts in the topic When one new number is included in an existing set of 6 numbers chetan86 4 12 Sep 2014, 06:24
2 Experts publish their posts in the topic What is the value of x^6 + x^(-6) ? alphonsa 2 18 Aug 2014, 07:09
2 Experts publish their posts in the topic What is the value of 6^x*6^y? NoHalfMeasures 1 13 Aug 2014, 10:17
Display posts from previous: Sort by

The results of a certain experiment included 6 data values

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


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

Powered by phpBB © phpBB Group and phpBB SEO

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®.