Answer
The sample space will be the set of all the values of the mass we obtain by measuring material feeds of the same kind using that scale.
Work Step by Step
We can say that the sample space is the mass of certain chemical products of the same kind as measured by the scale. In other words, if we have a certain material feeds, we will measure in general a slightly different value, so the set of all of these values we get (mass in tons with two decimal places precision) will make the sample space.