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Re: Set V consists of 2 distinct positive values. What is the [#permalink]
06 May 2012, 08:23
The answer has to be B. After simplifying the question, we can arrive to below: Let's assume the 2 distinct +ve numbers as x and y. Assuming y>x. Mean= x+y/2 S.D = SQRT(((x+y/2) -x)^2 + (y-(x+y/2))^2)/2) =SQRT(((x+y-2x)/2)^2 + ((2y-y-x)/2)^2/2) =SQRT((y-x)^2/2) =y-x/sqrt(2)...so we just need to know the diff between y and x and we get it from the 2nd statement which gives us the range.