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 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
Live EA class + 6 months of EA OnDemand
  • Expert-led weekly online sessions
  • EA Masterclass access between classes
View EA class & enroll
Limited cohort · enrollment openTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

130-point 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.

looks tricky! but simple

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Junior | Next Rank: 30 Posts
Posts: 22
Joined: Thu Jul 10, 2008 1:51 pm
Location: london
by desiguy » Tue Jul 22, 2008 4:28 am
for a certain examination a score of 58 was 2 standard deviations below the mean and a score of 98 is 3 standard deviations above the mean. what was the mean score ?

74,76, 78, 80,82

Please solve
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
Legendary Member
Posts: 829
Joined: Mon Jul 07, 2008 10:09 pmFollowed by: 3 members
Location: INDIA
Thanked: 84 times

by sudhir3127 » Tue Jul 22, 2008 4:41 am
Let M = mean
Let SD = stand deviation

M + 3SD = 98
M - 2SD = 58

solve it

5SD = 40
SD = 8


M - 2(8) = 58
M = 58 + 16
M = 74


hope it helps...
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 82
Joined: Wed Jun 18, 2008 4:26 pm
Thanked: 10 times

by newera » Tue Jul 22, 2008 4:47 am
OA is 74.

This is very simple, so don't worry.

Basically you want to figure out how many units is included in one standard deviation. So take your highest number 98 substract the lowest value from it. 98-58=40. Divide this by the total number of standard deviations. 40/5=8.

Now we know that one std deviation has 8 units. As such, we can figure out the mean.

58 is 2 std dev away from the mean --> 58 + 2(8)=74

98 is 3 std dev above the mean --> 98 - 3(8)=74
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1