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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 ## stats ##### This topic has 2 member replies ## stats If set S = {7, y, 12, 8, x, 9}, is x + y less than 18? (1) The range of set S is less than 9. (2) The average of x and y is less than the average of set S. OA b But I dont get the reasoning. I would like to have a step by step explanation of why B is correct. What I did for B: I just plugged in a few numbers.That is what I usually do when I dont have a quick nice approach to tackle the question. Should I change this strategy? It doesnt always work out all right... How many questions on Stats in the real GMAT? By stats I mean what includes mean, range, std, median.... THANKS Legendary Member Joined 20 Jun 2007 Posted: 1153 messages Followed by: 2 members Upvotes: 146 Target GMAT Score: V50 ricaototti wrote: If set S = {7, y, 12, 8, x, 9}, is x + y less than 18? (1) The range of set S is less than 9. (2) The average of x and y is less than the average of set S. OA b But I dont get the reasoning. I would like to have a step by step explanation of why B is correct. What I did for B: I just plugged in a few numbers.That is what I usually do when I dont have a quick nice approach to tackle the question. Should I change this strategy? It doesnt always work out all right... How many questions on Stats in the real GMAT? By stats I mean what includes mean, range, std, median.... THANKS Statement I range of the set is less than 9, x could be anything and y could be anything. x+y can be less than 18, x+y can be more than 18. Insufficient. Statement II (x+y)/2 < (36+x+y)/6 (x+y)/2 < 6 + (x+y)/6 x+y < 12 + (x+y)/3 If you insert values for x and y, you will notice that x+y will always be less than 18 to satisfy the above equation. Answer is no. Hence Sufficient. Answer is B. You can see anywhere between 2-3 questions on stats, but it could be more or it could be less on the actual GMAT. Hope this helps. Senior | Next Rank: 100 Posts Joined 23 Jun 2008 Posted: 35 messages Upvotes: 2 I think ricaototti's solutions is correct. However, you can further simplify (x+y)/2 < (36+x+y)/6 to give x+y<18 • Free Veritas GMAT Class Experience Lesson 1 Live Free Available with Beat the GMAT members only code • Magoosh Study with Magoosh GMAT prep Available with Beat the GMAT members only code • Get 300+ Practice Questions 25 Video lessons and 6 Webinars for FREE Available with Beat the GMAT members only code • Free Practice Test & Review How would you score if you took the GMAT Available with Beat the GMAT members only code • FREE GMAT Exam Know how you'd score today for$0

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