  Let $G$ be a finite group and $\psi(G) = \sum_{g \in G} o(g)$, where $o(g)$
denotes the order of $g \in G$. First, we prove that if $G$ is a group of order
$n$ and $\psi(G) >31\psi(C_n)/77$, where $C_n$ is the cyclic group of order
$n$, then $G$ is supersolvable. This proves a conjecture of
M.~{T\u{a}rn\u{a}uceanu}. Moreover, M. Herzog, P. Longobardi and M. Maj put
forward the following conjecture: If $H\leq G$, then $\psi(G) \leqslant \psi(H)
|G:H|^2$. In the sequel, by an example we show that this conjecture is not
satisfied in general.
