Screenshot $2024-05-31$ at $3\mathrm{.}36\mathrm{.}57$ PMThe local artisan bakery is studying its billing process. Data was collected over the past $15-$day period as shown in the Table.

$\backslash$table$[[$Day$,$Number of Bills,Number of Errors$],[1,54,6],[2,76,8],[3,67,8],[4,89,20],[5,76,13],[6,84,11],[7,61,11],[8,73,10],[9,90,14],[10,98,10],[11,82,13],[12,64,13],[13,72,10],[14,88,11],[15,86,12]]$

Construct an appropriate control chart for errors per bill. Is the process in control?