Four Samples of 100 Each Were Taken from an Assembly

question 197

Multiple Choice

Four samples of 100 each were taken from an assembly line,with the following results:
$$\begin{array} { | c | c | } \hline \begin{array} { c } \text { Sample } \\\text { Number }\end{array} & \begin{array} { c } \text { Number } \\\text { Defective }\end{array} \\\hline 1 & 6 \\2 & 12 \\3 & 2 \\4 & 8 \\\hline\end{array}$$
Using the historical average as the central line of the chart,which one of the following is the limits for an attributes control chart with z = 2?

• A) UCL > 0.1 and LCL > 0.03
• B) UCL > 0.1 and LCL < 0.03
• C) UCL < 0.1 and LCL > 0.03
• D) UCL < 0.1 and LCL < 0.03