Answer
5.75
Work Step by Step
$101.11_2=$
$1\times2^2+0\times2^1+1\times2^0+1\times\frac{1}{2}+1\times\frac{1}{4}=$
$4+0+1+\frac{1}{2}+\frac{1}{4}=5\frac{3}{4}=$
$4+0+1+\frac{2}{4}+\frac{1}{4}=5\frac{3}{4}=$
$5.75$
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