Answer
4.125
Work Step by Step
$100.001_2=1\times2^2+0\times2^1+0\times2^0+1\times\frac{1}{2}+1\times\frac{1}{4}+1\times\frac{1}{8}$
$=4+0+0+0+0+\frac{1}{8}=4\frac{1}{8}=4.125$
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