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# M11-09

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Math Expert
Joined: 02 Sep 2009
Posts: 94614
Own Kudos [?]: 643733 [24]
Given Kudos: 86753
Math Expert
Joined: 02 Sep 2009
Posts: 94614
Own Kudos [?]: 643733 [7]
Given Kudos: 86753
Math Expert
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Posts: 94614
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General Discussion
Intern
Joined: 25 Apr 2015
Posts: 6
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What about choice A? {ab, b2, cb} = b{a,b,c)?
Manager
Joined: 15 Apr 2016
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rhio wrote:
What about choice A? {ab, b2, cb} = b{a,b,c)?

Hi Rhio,

Multiplication changes the standard deviation.
Here we are multiplying everything with b which means even the SD is being multiplies with b.

Hope this helps

-------------------------
Shrivathsan
GMAT 700 it is ---
Senior Manager
Joined: 31 Mar 2016
Posts: 324
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Location: India
Concentration: Operations, Finance
GMAT 1: 670 Q48 V34
GPA: 3.8
WE:Operations (Commercial Banking)
I think this is a high-quality question and I agree with explanation.
Current Student
Joined: 01 Jun 2020
Posts: 131
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Location: Brazil
GMAT 1: 760 Q48 V46
I think this is a high-quality question and I agree with explanation.
Stanford School Moderator
Joined: 11 Jun 2019
Posts: 113
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Location: India
Bunuel - I have a very basic doubt on solving quant questions generally. How do we know when to pick numbers and when to solve the question directly, just by looking at the question? I tried picking up numbers for this question and wasted a lot of time in the process and didn't even get the answer in the first place.
Current Student
Joined: 06 Jul 2019
Posts: 135
Own Kudos [?]: 59 [0]
Given Kudos: 747
Location: India
Concentration: General Management, Strategy
GMAT 1: 640 Q39 V39
GMAT 2: 700 Q48 V38 (Online)
GPA: 3.11
WE:Project Management (Computer Software)
I think this is a high-quality question and I agree with the explanation.
Intern
Joined: 06 Sep 2020
Posts: 19
Own Kudos [?]: 3 [0]
Given Kudos: 278
Location: India
GMAT 1: 640 Q48 V31
Why is C wrong ? Adding/ subtracting "A" from each should not change the answer?
Math Expert
Joined: 02 Sep 2009
Posts: 94614
Own Kudos [?]: 643733 [0]
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RRJ12 wrote:
Why is C wrong ? Adding/ subtracting "A" from each should not change the answer?

The SD will not change if we ONLY add or ONLY subtract a constant from each term in a set. In C we are subtracting from a from a and c but adding a to b.
Math Expert
Joined: 02 Sep 2009
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I have edited the question and the solution by adding more details to enhance its clarity. I hope it is now easier to understand.
Intern
Joined: 24 Dec 2022
Posts: 48
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