geom_smooth：它的含义是什么（为什么它低于平均值？）

I have data on the number of trips people make to work per week. Along with the distance of the trip, I am interested in the relationship between the two variables. (Frequency is expected to fall as distance increases, essentially a negative relationship.) Cor.test supports this hypothesis: -0.08993444 with a p value of 2.2e-16.I have data on the number of trips people make