Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 26 May 2017, 15:23

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

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

The results of a certain experiment included 6 data values

Author Message
TAGS:

Hide Tags

Manager
Joined: 06 Apr 2010
Posts: 144
Followers: 3

Kudos [?]: 741 [0], given: 15

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

Show Tags

23 Jun 2010, 12:30
00:00

Difficulty:

25% (medium)

Question Stats:

78% (01:51) correct 22% (01:03) wrong based on 129 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
Math Expert
Joined: 02 Sep 2009
Posts: 38908
Followers: 7739

Kudos [?]: 106244 [2] , given: 11618

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

Show Tags

23 Jun 2010, 15:31
2
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.

_________________
CEO
Status: Nothing comes easy: neither do I want.
Joined: 12 Oct 2009
Posts: 2786
Location: Malaysia
Concentration: Technology, Entrepreneurship
Schools: ISB '15 (M)
GMAT 1: 670 Q49 V31
GMAT 2: 710 Q50 V35
Followers: 238

Kudos [?]: 1727 [0], given: 235

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

Show Tags

23 Jun 2010, 15:49
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

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
Joined: 09 Sep 2013
Posts: 15466
Followers: 649

Kudos [?]: 209 [0], given: 0

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

Show Tags

10 Jul 2015, 00:34
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.
_________________
EMPOWERgmat Instructor
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 9122
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: 340 Q170 V170
Followers: 445

Kudos [?]: 2873 [1] , given: 169

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

Show Tags

10 Jul 2015, 16:15
1
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.

[Reveal] Spoiler:
B

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

760+: Learn What GMAT Assassins Do to Score at the Highest Levels
Contact Rich at: Rich.C@empowergmat.com

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, 16:15
Similar topics Replies Last post
Similar
Topics:
19 If a number N is decreased by p percent and then the resulting value 14 11 Jan 2017, 01:13
4 What is the value of 120(6)^x ? 8 22 Feb 2015, 21:40
4 When one new number is included in an existing set of 6 numbers 4 29 Mar 2016, 19:35
2 What is the value of x^6 + x^(-6) ? 2 18 Aug 2014, 09:31
2 What is the value of 6^x*6^y? 1 13 Aug 2014, 11:24
Display posts from previous: Sort by