November 17, 2018 November 17, 2018 07:00 AM PST 09:00 AM PST Nov. 17, 7 AM PST. Aiming to score 760+? Attend this FREE session to learn how to Define your GMAT Strategy, Create your Study Plan and Master the Core Skills to excel on the GMAT. November 17, 2018 November 17, 2018 09:00 AM PST 11:00 AM PST Join the Quiz Saturday November 17th, 9 AM PST. The Quiz will last approximately 2 hours. Make sure you are on time or you will be at a disadvantage.
Author 
Message 
TAGS:

Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 50619

Question Stats:
67% (01:03) correct 33% (01:39) wrong based on 138 sessions
HideShow timer Statistics



Math Expert
Joined: 02 Sep 2009
Posts: 50619

Re M2215
[#permalink]
Show Tags
16 Sep 2014, 00:16



Intern
Joined: 11 Nov 2014
Posts: 34
Concentration: Technology, Strategy
GMAT 1: 660 Q48 V31 GMAT 2: 720 Q50 V37
GPA: 3.6
WE: Consulting (Consulting)

Re: M2215
[#permalink]
Show Tags
01 Jul 2015, 18:07
It´s not clear that the set has all 4 onedigit integers that are prime. One may understand that all items in the set are one digit integers (which would give you {2,3} or {3,5} or {2,3,5}.... just the way it´s written there is room for misunderstanding...



Current Student
Joined: 26 Sep 2014
Posts: 9
Location: India
GPA: 3.2

michaelyb wrote: It´s not clear that the set has all 4 onedigit integers that are prime. One may understand that all items in the set are one digit integers (which would give you {2,3} or {3,5} or {2,3,5}.... just the way it´s written there is room for misunderstanding... Also, nowhere is it mentioned that all of them are positive.



Math Expert
Joined: 02 Sep 2009
Posts: 50619

Re: M2215
[#permalink]
Show Tags
31 Oct 2015, 03:00



Intern
Joined: 04 Aug 2014
Posts: 29
GMAT 1: 620 Q44 V31 GMAT 2: 620 Q47 V28
GPA: 3.2

Re: M2215
[#permalink]
Show Tags
07 Mar 2017, 03:29
hi Brunel how can you pick these numbers.For example if set is 2,3,5 then median is 3.after adding x median will become 3.75 so as per your statement number can't be less than 3.75
kindly clear where I am going wrong in my understanding



Math Expert
Joined: 02 Sep 2009
Posts: 50619

Re: M2215
[#permalink]
Show Tags
07 Mar 2017, 04:02
sidagar wrote: hi Brunel how can you pick these numbers.For example if set is 2,3,5 then median is 3.after adding x median will become 3.75 so as per your statement number can't be less than 3.75
kindly clear where I am going wrong in my understanding The question says that the set consists of singledigit prime integers. There are four single digit primes: 2, 3, 5, and 7. So, the set is {2, 3, 5, 7} not {2, 3, 5}
_________________
New to the Math Forum? Please read this: Ultimate GMAT Quantitative Megathread  All You Need for Quant  PLEASE READ AND FOLLOW: 12 Rules for Posting!!! Resources: GMAT Math Book  Triangles  Polygons  Coordinate Geometry  Factorials  Circles  Number Theory  Remainders; 8. Overlapping Sets  PDF of Math Book; 10. Remainders  GMAT Prep Software Analysis  SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS)  Tricky questions from previous years.
Collection of Questions: PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.
What are GMAT Club Tests? Extrahard Quant Tests with Brilliant Analytics



Intern
Joined: 04 Oct 2016
Posts: 13

Re M2215
[#permalink]
Show Tags
04 Sep 2017, 10:22
I think this is a poorquality question. It says all distinct one digit prime numbers, however it can be unclear. I understood it as ALL the numbers in the set were distinict prime digits, not that they set included ALL the prime single digits



Intern
Joined: 31 Jan 2017
Posts: 6

Re: M2215
[#permalink]
Show Tags
06 Nov 2017, 05:10
Bunuel wrote: the number added cannot be less than 5. Hello Bunuel, can you please explain this in more detail? Would be happy to understand this.



Manager
Joined: 23 Jun 2016
Posts: 109

since the new median is 5, all options except B are wrong....????
in other words, if the question mentioned that the median grew by atleast 35%, A would be the answer.



Math Expert
Joined: 02 Sep 2009
Posts: 50619

Re: M2215
[#permalink]
Show Tags
15 Nov 2017, 22:18
sevenplusplus wrote: If after a number was added to a set consisting of all distinct onedigit prime integers, the median of the set grew by 25%, which of the following cannot be the value of the number added?
A. 4.8 B. 5.0 C. \(\sqrt{29}\) D. 7.7 E. \(\frac{49}{4}\)
The original set was \(\{2, 3, 5, 7\}\). Its median was \(\frac{3 + 5}{2} = 4\). The median of the new set \(= 4*1.25 = 5\). Thus, the number added cannot be less than 5.
Answer: A
since the new median is 5, all options except B are wrong....????
in other words, if the question mentioned that the median grew by atleast 35%, A would be the answer. You are wrong. The original set = {2, 3, 5, 7}. The original median = 4. B. New number = 5; New set = {2, 3, 5, 5, 7}. New median = 5. C. New number = \(\sqrt{29}\); New set = 2, 3, 5, \(\sqrt{29}\), 7}. New median = 5. D. New number = 7.7; New set = {2, 3, 5, 7, 7.7}. New median = 5. E. New number = \(\frac{49}{4}\); New set = {2, 3, 5, 7, 49/4}. New median = 5.
_________________
New to the Math Forum? Please read this: Ultimate GMAT Quantitative Megathread  All You Need for Quant  PLEASE READ AND FOLLOW: 12 Rules for Posting!!! Resources: GMAT Math Book  Triangles  Polygons  Coordinate Geometry  Factorials  Circles  Number Theory  Remainders; 8. Overlapping Sets  PDF of Math Book; 10. Remainders  GMAT Prep Software Analysis  SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS)  Tricky questions from previous years.
Collection of Questions: PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.
What are GMAT Club Tests? Extrahard Quant Tests with Brilliant Analytics



Manager
Joined: 23 Jun 2016
Posts: 109

Re: M2215
[#permalink]
Show Tags
16 Nov 2017, 07:07
Bunuel wrote: sevenplusplus wrote: If after a number was added to a set consisting of all distinct onedigit prime integers, the median of the set grew by 25%, which of the following cannot be the value of the number added?
A. 4.8 B. 5.0 C. \(\sqrt{29}\) D. 7.7 E. \(\frac{49}{4}\)
The original set was \(\{2, 3, 5, 7\}\). Its median was \(\frac{3 + 5}{2} = 4\). The median of the new set \(= 4*1.25 = 5\). Thus, the number added cannot be less than 5.
Answer: A
since the new median is 5, all options except B are wrong....????
in other words, if the question mentioned that the median grew by atleast 35%, A would be the answer. You are wrong. The original set = {2, 3, 5, 7}. The original median = 4. B. New number = 5; New set = {2, 3, 5, 5, 7}. New median = 5. C. New number = \(\sqrt{29}\); New set = 2, 3, 5, \(\sqrt{29}\), 7}. New median = 5. D. New number = 7.7; New set = {2, 3, 5, 7, 7.7}. New median = 5. E. New number = \(\frac{49}{4}\); New set = {2, 3, 5, 7, 49/4}. New median = 5. Thanks. That clarifies. Sent from my iPhone using GMAT Club Forum mobile app



Intern
Joined: 06 Jun 2016
Posts: 15

Re: M2215
[#permalink]
Show Tags
19 Apr 2018, 10:24
michaelyb wrote: It´s not clear that the set has all 4 onedigit integers that are prime. One may understand that all items in the set are one digit integers (which would give you {2,3} or {3,5} or {2,3,5}.... just the way it´s written there is room for misunderstanding... Hi Bunuel, I agree with michaelyb. It is possible to revise the question? "If after a number was added to a set consisting entirely of all the distinct onedigit prime integers, the median of the set grew by 25%, which of the following cannot be the value of the number added?" Thank you.



Manager
Joined: 17 Jan 2017
Posts: 61

In my opionion the question is absolutely clear. No revision needed... "...set consisting of all distinct onedigit prime integers..." all onedigit primes (2,3,5,7) and no other integers.










