$$\frac{\sum fd}{\sum f}\cdot\frac{4,01}{110}$$
$\frac{401d}{11000}$
$$d\times \frac{4,01}{110}$$
$$d\times \frac{401}{11000}$$
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$\frac{401}{11000} = 0.036454545454545455$
$$\frac{\mathrm{d}}{\mathrm{d}d}(d\times \frac{4,01}{110})$$
$$\frac{\mathrm{d}}{\mathrm{d}d}(d\times \frac{401}{11000})$$
$$\frac{401}{11000}d^{1-1}$$
$$\frac{401}{11000}d^{0}$$
$$\frac{401}{11000}\times 1$$
$$\frac{401}{11000}$$