A school tracks the absences of pupils as part of a flu
surveillance system. Regular reporting of absences among 25
students in grade 1 are taken, and based on these data, the
long-run proportion of absences under normal conditions is
estimated to be p = 0.074. What is the upper control limit for a p
chart of future absences from this class of size 25?
a) 0.859
b) 0.237
c) 0.231
d) 0.651