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?
Std dev can't be -ve, but can be 0. 0 is neither +ve nor -ve.
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