Without going to the 2R(Range) part,
Why do you think MD=SD ?
That is NOT generally true (although data can be constructed such that MD = SD).
For example: x=[−10,0,10],SD(x)=3(102+0+102)= 2.72
(or another answer if you divide by N−1 instead of N )
MD(x)=3(10+0+10)=6.66...
SD(x)=MD(x)
Hence, MD=SD=2R
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