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10 Aug 2011, 11:36
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Hi,
Can anyone please explain me this questions from one of the gmat club test - M08 Q9
If set T consists of odd integers divisible by 5, is the standard deviation of T positive?
1. All members of T are positive
2. T consists of only one member
Statement (1) by itself is insufficient. S1 doesn't help answer the question.
I don't understand the above explanation for statement 1.
Under what circumstances can the standard deviation be negative? none right?
Please explain.
Thanks!
Can anyone please explain me this questions from one of the gmat club test - M08 Q9
If set T consists of odd integers divisible by 5, is the standard deviation of T positive?
1. All members of T are positive
2. T consists of only one member
Statement (1) by itself is insufficient. S1 doesn't help answer the question.
I don't understand the above explanation for statement 1.
Under what circumstances can the standard deviation be negative? none right?
Please explain.
Thanks!
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16 Aug 2011, 10:59
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[quote="teal"]Hi,
Can anyone please explain me this questions from one of the gmat club test - M08 Q9
If set T consists of odd integers divisible by 5, is the standard deviation of T positive?
1. All members of T are positive
2. T consists of only one member
Statement (1) by itself is insufficient. S1 doesn't help answer the question.
I don't understand the above explanation for statement 1.
well i have my struggle with SD, but if i get it right then:
S1- SD can be positive if the set is 5 15 20 i.e but can be 0 if the set is 5 5 5 5 so not suf.
S2- only one number in a set wll allways have SD 0 so the answer is definately NO. suff.
Can anyone please explain me this questions from one of the gmat club test - M08 Q9
If set T consists of odd integers divisible by 5, is the standard deviation of T positive?
1. All members of T are positive
2. T consists of only one member
Statement (1) by itself is insufficient. S1 doesn't help answer the question.
I don't understand the above explanation for statement 1.
well i have my struggle with SD, but if i get it right then:
S1- SD can be positive if the set is 5 15 20 i.e but can be 0 if the set is 5 5 5 5 so not suf.
S2- only one number in a set wll allways have SD 0 so the answer is definately NO. suff.
