Convergence Rate for The Number of Crossing in a Random Labelled Tree

We consider the number of crossings in a random labelled tree with vertices in convex position. We give a new proof of the fact that this quantity is asymptotically Gaussian with mean $n^2/6$ and variance $n^3/45$. Furthermore, we give an estimate for the Kolmogorov distance to a Gaussian distribution which implies a convergence rate of order $n^{-1/2}$.Comment: 9 pages. arXiv admin note: text overlap with arXiv:2205.0399