Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 22
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemandStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemandStart anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 563 reviewsTarget Test Prep

DS

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 34
Joined: Tue Apr 07, 2009 1:55 am
by trust123 » Sun Aug 09, 2009 8:39 am
plz explain the concepts of std deviation ,, mean,, mode i m weak in this area........ i cn consistently score 47-49 in math section.......... i think the difference b/w me and 51 is this topic......so if any 1 can explain me thi topic i ll be really greatful
You do not have the required permissions to view the files attached to this post.
Top
Join the discussion
Source: — Data Sufficiency |
Legendary Member
Posts: 527
Joined: Thu May 01, 2008 12:06 am
Thanked: 7 times

by real2008 » Sun Aug 09, 2009 9:27 am
is the answre D
Top
Join the discussion
Master | Next Rank: 500 Posts
Posts: 175
Joined: Mon Feb 09, 2009 3:57 pm
Thanked: 4 times

by tom4lax » Tue Aug 11, 2009 4:59 am
I also got D. Key in on the underlined word, different.
Say we have the 5 numbers, A B C D E. Question is asking, is (D+E)/2>70? D+E>140?

Statement I
median is 70. If C=70, then D and E have to be at least 71 and 72. 71+72>140. Sufficient

Statement II
This one is easier to think about intuitively. If the average of the whole set is 70, and each number is different, then the two greatest numbers need to be at least 70 each in order to balance out A + B. Sufficient.
Top
Join the discussion
Senior | Next Rank: 100 Posts
Posts: 38
Joined: Tue Jan 27, 2009 10:24 am

by sanjay_dce » Tue Aug 11, 2009 8:26 am
real2008 wrote:is the answre D
agree D is d ans
Top
Join the discussion