$$\frac{1}{8}+\frac{1}{2}+\frac{1}{8}$$
$\frac{3}{4}=0.75$
$$\frac{1}{8}+\frac{4}{8}+\frac{1}{8}$$
$$\frac{1+4}{8}+\frac{1}{8}$$
$$\frac{5}{8}+\frac{1}{8}$$
$$\frac{5+1}{8}$$
$$\frac{6}{8}$$
$$\frac{3}{4}$$
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$\frac{3}{2 ^ {2}} = 0.75$