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For (2n+1) observations {x}_{{{1}}},{x}_{{{2}}},-{x}_{{{2}}},.
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For (2n+1) observations and 0, where all x's are distinct, let SD and MD denote the standard deviation and median, respectively. Then which of the following is always true ?

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Question Text
For (2n+1) observations and 0, where all x's are distinct, let SD and MD denote the standard deviation and median, respectively. Then which of the following is always true ?