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# a is the standard deviation of set A. b is the standard

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Senior Manager
Joined: 19 Feb 2004
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Location: Lungi
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a is the standard deviation of set A. b is the standard [#permalink]  21 Feb 2004, 09:20
a is the standard deviation of set A. b is the standard deviation of setB. Is a > b?
a. both sets consist of 7 terms.
b. Set A consists of consecutive odd integers and set B consists of consecutive even integers.
SVP
Joined: 30 Oct 2003
Posts: 1797
Location: NewJersey USA
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Kudos [?]: 41 [0], given: 0

I will go with B on this one
SVP
Joined: 30 Oct 2003
Posts: 1797
Location: NewJersey USA
Followers: 5

Kudos [?]: 41 [0], given: 0

I believe it has to be C
Senior Manager
Joined: 19 Feb 2004
Posts: 415
Location: Lungi
Followers: 1

Kudos [?]: 8 [0], given: 0

yes the ans is C.
To find the std deviation, it is necessary to know both the number of terms and the distance of each term from the average.
1. is insufficient , since it only tells us theat the number of terms in both sets is equal.
2. insufficient, since even though the distance between each term is given, the average of the terms will vary when the number of terms is even, from when it is odd.

the statements combined are sufficient. The avg of each set will be the fourth term, and each of the seven terms is 2 away from each term closest to it.
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