Determine the Trial UCL for a Fraction Nonconforming Chart for May

Short Answer

Determine the trial UCL for a fraction nonconforming chart for May 8 where the trial central line is 0.012. Is May 8 in control or out of control and why? $$\begin{array} { l c c } \text { Date } & \text { Number } & \text { Number } \\ & \text { Inspected } & \text { Nonconforming } \\\text { May 7 } & 600 & 11 \\\text { May 8 } & 435 & 28 \\\text { May 9 }& 582 & 6 \\& \square = 10,000 & \square = 120\end{array}$$