BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

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.

★★★★★5.0559 reviews
GMATLiveTeach Starts Oct 17
Chris Peckover, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Chris Peckover, 100th-Percentile GMAT Scorer

Oct 17 · Chris Peckover
Sat · 11:00 AM to 2:00 PM ET
Oct 20 · Chris Peckover
Tue, Thu · 8:00 to 10:00 PM ET
Oct 25 · Josh Braslow
Sun · 1:00 to 4:00 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
EALiveTeachOnDemand 5 seats left Start anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Sun · 9:30 AM to 12:30 PM ET
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
GMATOnDemand Start 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 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

Mean with 2 unknowns

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |

GMAT/MBA Expert

User avatar
Elite Legendary Member
Posts: 10392
Joined: Sun Jun 23, 2013 6:38 pmFollowed by: 511 members
Location: Palo Alto, CA
Thanked: 2867 times
GMAT Score:800

by [email protected] » Thu Sep 19, 2013 1:52 pm
Hi SaraLotfy,

These types of questions are perfect for TESTing values.

We're given 6 numbers: 1, 5, 6, 7, X?, Y? and we're told that X and Y are POSITIVE INTEGERS.

We're asked if the mean is > the median....this is a YES/NO question. The answer is clearly going to depend on the values of X and Y

Fact 1) X + Y = 7

Here, the group would have a sum of 26, so the mean = 4.333333

If X = 1, Y = 6 and we have 1,1,5,6,6,7 so the median = 5.5 and the answer is NO
If X = 2, Y = 5 and we have 1,2,5,5,6,7 so the median = 5 and the answer is NO
If X = 3, Y = 4 and we have 1,3,4,5,6,7 so the median = 4.5 and the answer is NO
Fact 1 is SUFFICIENT

Fact 2) X - Y = 3

If X = 4, Y = 1 and we have 1,1,4,5,6,7 so the mean = 4, the median = 4.5 and the answer is NO
If X = 100, Y = 97 and we have 1,5,6,7,97,100 so the mean = BIG, the median = 6.5 and the answer is YES
Fact 2 is INSUFFICIENT

Final Answer: A

GMAT assassins aren't born, they're made,
Rich
Contact Rich at [email protected]
Image
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 33
Joined: Thu Dec 20, 2018 2:09 am

by masoom j negi » Fri Dec 21, 2018 9:10 pm
To find the mean of the sets we need to know the sum of x and y.
Statement 1. Mean of the set = (6 + 7 + 1 + 5 + 7)/6 = 26/6 = 4.33.
Since, x and y are positive integer, their possible values are (1,6), (2, 5), (3,4)
So, possible sets are {1, 1, 5, 6, 6, 7}. Median = (5+6)/2 = 5.5
{1, 2, 5, 5, 6, 7}. Median = 10/2 = 5
{1, 3, 4, 5, 6, 7}. Median = 9/2 = 4.5.
All possible values of median are greater than mean. Hence, Sufficient.
Statement 2. We need the sum of x and y to find the mean and not the difference of x and y. Hence, Insufficient.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1