Answer
$3428 \ mg$
Work Step by Step
The mean measurement is given by
$$
\frac{1}{10}(
3414\ mg+ 3433\ mg+ 3431\ mg+ 3419 \ mg+ 3441\ mg+
3417\ mg+ 3427\ mg+ 3434\ mg+ 3435\ mg+ 3432\ mg
)
= 3428.3 \ mg\approx3428 \ mg
.$$
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