  Kostant's partition function counts the number of distinct ways to express a
weight of a classical Lie algebra $\mathfrak{g}$ as a sum of positive roots of
$\mathfrak{g}$. We refer to each of these expressions as decompositions of a
weight. Our main result considers an infinite family of weights, irrespective
of Lie type, for which we establish a closed formula for the $q$-analog of
Kostant's partition function and then prove that the (normalized) distribution
of the number of positive roots in the decomposition of any of these weights
converges to a Gaussian distribution as the rank of the Lie algebra goes to
infinity. We also extend these results to the highest root of the classical Lie
algebras and we end our analysis with some directions for future research.
