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100 points for $49 worth of Veritas practice GMATs FREE VERITAS PRACTICE GMAT EXAMS Earn 10 Points Per Post Earn 10 Points Per Thanks Earn 10 Points Per Upvote ## For a certain exam, a score of 58 was 2 standard deviations tagged by: AAPL ##### This topic has 1 expert reply and 0 member replies ### Top Member ## For a certain exam, a score of 58 was 2 standard deviations ## Timer 00:00 ## Your Answer A B C D E ## Global Stats Difficult GMAT Prep For a certain exam, a score of 58 was 2 standard deviations below mean and a score of 98 was 3 standard deviations above mean. What was the mean score for the exam? A. 74 B. 76 C. 78 D. 80 E. 82 OA A ### GMAT/MBA Expert GMAT Instructor Joined 25 Apr 2015 Posted: 2624 messages Followed by: 18 members Upvotes: 43 AAPL wrote: GMAT Prep For a certain exam, a score of 58 was 2 standard deviations below mean and a score of 98 was 3 standard deviations above mean. What was the mean score for the exam? A. 74 B. 76 C. 78 D. 80 E. 82 OA A If we let x = mean and s = standard deviation, then a score of 58 that was 2 standard deviations below the mean would mean 58 = x - 2s. Similarly, a score of 98 that was 3 standard deviations above the mean would mean 98 = x + 3s. We can use the two equations to determine a value of x. x - 2s = 58 x + 3s = 98 If we subtract the first equation from the second equation, we have: 5s = 40 s = 8 Now we can determine x: x + 3s = 98 x + 3(8) = 98 x + 24 = 98 x = 74 Answer: A _________________ Scott Woodbury-Stewart Founder and CEO scott@targettestprep.com See why Target Test Prep is rated 5 out of 5 stars on BEAT the GMAT. Read our reviews • Magoosh Study with Magoosh GMAT prep Available with Beat the GMAT members only code • FREE GMAT Exam Know how you'd score today for$0

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