Professor Murphy Wants to Set Up a Control Chart to Monitor

Professor Murphy wants to set up a control chart to monitor the percentage of absenteeism in his introductory statistics course (50 students are registered) . Absences per period for the last 15 class sessions are in the table below. $$\begin{array} { | l | c | c | c | c | c | c | c | c | c | c | c | c | c | c | c | } \hline \text { Session } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 & 11 & 12 & 13 & 14 & 15 \\\hline \text { Absent } & 5 & 0 & 2 & 2 & 3 & 8 & 10 & 3 & 5 & 5 & 1 & 2 & 0 & 2 & 3 \\\hline\end{array}$$ Using 3 sigma limits, calculate lower and upper control limits for a p-chart to track absences.

A) 0, .252
B) 0, .175
C) 0, .114
D) -0.038, .272