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# GMATPrep 2 - SD question

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Joined: 31 Dec 1969
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GMATPrep 2 - SD question [#permalink]  01 Jun 2008, 16:16
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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Re: GMATPrep 2 - SD question [#permalink]  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: United States
Concentration: Marketing, Other
GMAT 1: 710 Q49 V38
WE: Accounting (Accounting)
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Kudos [?]: 32 [0], given: 54481

Re: GMATPrep 2 - SD question [#permalink]  01 Jun 2008, 16:49
Ohh I'm such an idiot, of course I can find the last number. Thanks again - ignore me please!!
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Re: GMATPrep 2 - SD question [#permalink]  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: United States
Concentration: Marketing, Other
GMAT 1: 710 Q49 V38
WE: Accounting (Accounting)
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Kudos [?]: 32 [0], given: 54481

Re: GMATPrep 2 - SD question [#permalink]  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.
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Re: GMATPrep 2 - SD question [#permalink]  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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