At the beginning of minute 2:00 where the standardized coefficient beta is interpreted with a moderate to strong predictive effect, but I can't seem to find any rules of thumb for the interpretation of the effect? So when is it weak, moderate and strong?

Question regarding bonus point. It says the following in the syllabus: "Students earning less than half of all points receive a fraction of the full bonus point that corresponds to the proportion of all points awarded.". How exactly is that calculated?