It really depends on the distribution of all movies before they get filtered.
If the initial distribution is normal, then it is likely to become slightly skewed to the right after the quality filtering.
If the initial distribution is slightly skewed to the left, then it may become normal after filtering.
However, it’s extremely hard to determine how the initial distribution looks like. Also, without much information about how the filtering works, we cannot know for sure how it’s going to affect the initial distribution, whatever it might look like.
With this in mind, I think it’s safer to assume that the distribution should be normal, and start building your reasoning from there.