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# GMATPrep 2 - SD question

Author Message
Joined: 31 Dec 1969
Location: Russian Federation
GMAT 3: 740 Q40 V50
GMAT 4: 700 Q48 V38
GMAT 5: 710 Q45 V41
GMAT 6: 680 Q47 V36
GMAT 9: 740 Q49 V42
GMAT 11: 500 Q47 V33
GMAT 14: 760 Q49 V44
WE: Supply Chain Management (Energy and Utilities)
GMATPrep 2 - SD question [#permalink]

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01 Jun 2008, 16:16
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

This may be a dumb question but, I don't understand why the answer isn't E considering both options only give us with 4 numbers in each set. Without knowing the 5th number, how can we know which SD is larger?
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Director
Joined: 23 Sep 2007
Posts: 782
Re: GMATPrep 2 - SD question [#permalink]

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01 Jun 2008, 16:38
If 45 is an integer in list T, then the other integer must be 35

If 25 is an integer in list S, then the other integer must be 55

Therefore the range of list S is bigger, and must have larger SD
Joined: 31 Dec 1969
Location: Russian Federation
GMAT 3: 740 Q40 V50
GMAT 4: 700 Q48 V38
GMAT 5: 710 Q45 V41
GMAT 6: 680 Q47 V36
GMAT 9: 740 Q49 V42
GMAT 11: 500 Q47 V33
GMAT 14: 760 Q49 V44
WE: Supply Chain Management (Energy and Utilities)
Re: GMATPrep 2 - SD question [#permalink]

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01 Jun 2008, 16:49
Ohh I'm such an idiot, of course I can find the last number. Thanks again - ignore me please!!
Director
Joined: 01 May 2007
Posts: 793
Re: GMATPrep 2 - SD question [#permalink]

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01 Jun 2008, 18:33
I understand we can get the 5th digit and also calculate SD if we wanted...but can you explain the relationship between SD and Range? How does the range help us calculate SD?
Joined: 31 Dec 1969
Location: Russian Federation
GMAT 3: 740 Q40 V50
GMAT 4: 700 Q48 V38
GMAT 5: 710 Q45 V41
GMAT 6: 680 Q47 V36
GMAT 9: 740 Q49 V42
GMAT 11: 500 Q47 V33
GMAT 14: 760 Q49 V44
WE: Supply Chain Management (Energy and Utilities)
Re: GMATPrep 2 - SD question [#permalink]

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01 Jun 2008, 19:22
I believe the greater the distance each number in the set is away from the mean then the larger the SD. So not the range, but the distance between the farthest data points and the mean.
Manager
Joined: 28 May 2008
Posts: 94
Re: GMATPrep 2 - SD question [#permalink]

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01 Jun 2008, 23:54
I am a little late.
Using 1, we can find out the missing number in s is 55
using 2 we can find the missing no in T= 35
hence standard deviation of s is more
Re: GMATPrep 2 - SD question   [#permalink] 01 Jun 2008, 23:54
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