$$\frac{5}{32}+\frac{7}{32}+\frac{5}{32}$$
$\frac{17}{32}=0.53125$
$$\frac{5+7}{32}+\frac{5}{32}$$
$$\frac{12}{32}+\frac{5}{32}$$
$$\frac{12+5}{32}$$
$$\frac{17}{32}$$
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$\frac{17}{2 ^ {5}} = 0.53125$