Very expensive handmade fly rods $(>$$$1200$ each$)$ are examined for defects:

Rod $12345678910$

Defects $1120132011$

The centerline for the appropriate control chart is:

$1\mathrm{.}09$

$1\mathrm{.}20$

$1\mathrm{.}32$

$0\mathrm{.}92$