Determine the Revised Central Line for a Count of Nonconformities

Determine the revised central line for a count of nonconformities chart. Assume any out-of-control points have assignable causes. Data not shown are in control. The trial central line is 0.80, the trial UCL is 2.00, and the trial LCL is 0. $$\begin{array} { c c c c } \begin{array} { c } \text { Lot } \\\text { Number }\end{array} & \begin{array} { c } \text { Sample } \\\text { Size }\end{array} & \begin{array} { c } \text { Count of } \\\text { Nonconformities }\end{array} & \begin{array} { c } \text { Count of non- } \\\text { conformities/unit }\end{array} \\55 & 5 & 2 & 0.40 \\56 & 5 & 5 & 1.00 \\57 & 5 & 11 & 2.20 \\& & & \\78 & 5 & 3 & 0.60 \\79 & 5 & 0 & 0.00 \\80 & 5 & 4 & 0.80\\\square=25 & \square=15 & \square=100\end{array}$$