A local newspaper has $10$ delivery boys who each deliver the morning paper to $50$ customers every day. The owner decides to record the number of papers delivered on time for a $10-$day period and

constructs a $p$ chart to see whether the percentage is too erratic.

What is the numerical value of the upper control limit for the $p$ chart?

a$.$ UCL$=1\mathrm{.}000$

b$.$ UCL$=1\mathrm{.}703$

c$.$ UCL$=0\mathrm{.}979$

d$.$ UCL$=0\mathrm{.}926$

Clear my choice