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GMATPrep 2 - SD question

olive
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GMATPrep 2 - SD question [#permalink] New post   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] New post   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
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Re: GMATPrep 2 - SD question [#permalink] New post   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] New post   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?
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Re: GMATPrep 2 - SD question [#permalink] New post   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] New post   01 Jun 2008, 23:54
I am a little late.
But yes answer is c
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



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Re: GMATPrep 2 - SD question [#permalink]
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