Instruction 18-3
a Political Pollster Randomly Selects a Sample of 100

Instruction 18-3
A political pollster randomly selects a sample of 100 voters each day for eight successive days and asks how many will vote for the incumbent. The pollster wishes to construct a p chart to see if the percentage favouring the incumbent candidate is too erratic.
$$\begin{array} { | c | c | } \hline \begin{array} { c } \text { Sample } \\\text { (Day) }\end{array} & \begin{array} { c } \text { Number Favouring } \\\text { Incumbent Candidate }\end{array} \\\hline 1 & 57 \\\hline 2 & 57 \\\hline 3 & 53 \\\hline 4 & 51 \\\hline 5 & 55 \\\hline 6 & 60 \\\hline 7 & 56 \\\hline 8 & 59 \\\hline\end{array}$$
-Referring to Instruction 18-3,what is the numerical value of the centre line for the p chart?

A) 0.63
B) 0.66
C) 0.56
D) 0.53