  We define so-called residual means, which have a Taylor expansion of the form
$M(x)=\bar x +\tfrac12 \xi_M(\bar x) \text{Var}(x)+o(\|x-\bar x\|^\alpha)$ for
some $\alpha>2$ and a single-variable function $\xi_M$ ($\bar x$~stands for the
arithmetic mean of the vector $x$), and show that all symmetric means which are
three times continuously differentiable are residual. We also calculate the
value of residuum for quasideviation means and a few subclasses of this family.
  Later, we apply it to establish the limit of the sequence
$\big(\frac{\text{Var}\ {\bf M}^{n+1}(x)}{(\text{Var}\ {\bf
M}^n(x))^2}\big)_{n=1}^\infty$, where ${\bf M} \colon I^p\to I^p$ is a
mean-type mapping consisting of $p$-variable residual means on an interval $I$,
and $x \in I^p$ is a nonconstant vector.
