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We study the mean value and quantum variance for ${\mathrm{SL}_{n}({\mathbbZ})}$ degenerate maximal parabolic Eisenstein series. We first establish a meanvalue result for the inner products \begin{equation*} \mu_{t, n}(f) =\int_{\mathrm{SL}_{n}(\mathbb{Z}) \backslash \mathfrak{h}^{n}} f(z)\left|E_{(n-1, 1)} \left(z, \frac{1}{2}+it, \mathbf{1} \right) \right|^{2}d\mu(z) \end{equation*} with $f$ in a restricted space of incomplete parabolicEisenstein series. Our estimate breaks the barrier with a polynomial powersaving beyond the prediction of the Generalised Lindel\"{o}f Hypothesis.Moreover, we prove a quantum variance formula for $\mu_{t, n}(f)$. This paperbuilds on the work of Zhang (2019) on quantum unique ergodicity for$\mathrm{SL}_{n}({\mathbb{Z}})$ degenerate Eisenstein series as well as thework of Huang (2021) on quantum variance for $\mathrm{SL}_{2}({\mathbb{Z}})$Eisenstein series.

Mean Values and Quantum Variance for Degenerate Eisenstein Series of Higher Rank