$$(\frac{2^{5}}{2^{8}})^{5}\times2^{-5}$$
$\frac{1}{1048576}\approx 0.000000954$
$$\left(\frac{1}{2^{3}}\right)^{5}\times 2^{-5}$$
$$\left(\frac{1}{8}\right)^{5}\times 2^{-5}$$
$$\frac{1}{32768}\times 2^{-5}$$
$$\frac{1}{32768}\times \frac{1}{32}$$
$$\frac{1}{1048576}$$
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$\frac{1}{2 ^ {20}} = 9.5367431640625 \times 10^{-7}$