Default Community Score Algorithm
Ryuusei allows you to set your default community score algorithm.
“Community score” refers to the overall score shown for media, typically on the detail page and in search results.
AniList has two different algorithms to calculate the community score: average and mean.
The “average” algorithm is a weighted average, and takes into account things like the popularity of the media. The “mean” algorithm is strictly an arithmetic mean.
This post on AniList has a little more detail about the difference between the two scoring algorithms.