On average, how many customers are in the system in a single server model?

$1\mathrm{.}48$

$1\mathrm{.}95$

$1\mathrm{.}29$

$12\mathrm{.}7$

$8\mathrm{.}41$

$7\mathrm{.}77$

$10\mathrm{.}5$