During which step of the scientific method does a scientist make an educated guess about the outcome of an experiment

hypothesis statement or the very beginning.

The answer is Hypothesis

Explanation:

To perform a scientific method, first the scientist must (1)observe an event of the environment, then, he goes on to the (2)introduction where the observed is analyzed and a question is generated, about the "Why?" of the facts. It is here that the scientist happens to make a supposition known as (3)hypothesis, which must be (4)experienced and (5)demonstrated to finally obtain (6)conclusions about it.

93.2 ml + 3920 ml = 4013 ml total  

(93.2 ml) * (2.03 m) / (4013 ml) = 0.0471 m

the volume in in l of the diluted solution would be 0.0471 m.